diff --git a/app/controllers/games_controller.rb b/app/controllers/games_controller.rb
index e6a592f51..1187ebafa 100644
--- a/app/controllers/games_controller.rb
+++ b/app/controllers/games_controller.rb
@@ -556,10 +556,19 @@ class GamesController < ApplicationController
     msg = @game.run_code_message
     msg.update_attributes(:status => 0, :message => nil) if msg.present?
 
-    # 更新时间是为了TPM端显示的更新，退出实训及访问实训的时候会更新
-    @myshixun.update_column(:updated_at, Time.now)
-
+    # 更新时间是为了TPM端显示的更新，退出实训及访问实训的时候会更新，如果版本库地址不存在，重新去版本库中找
+    myshixuns_update =
+        if @myshixun.repo_name.nil?
+          g = Gitlab.client
+          repo_name = g.project(@myshixun.gpid).path_with_namespace
+          {repo_name: repo_name}
+        else
+          {updated_at: Time.now}
+        end
+    logger.info("#############myshixuns_update: ##{myshixuns_update}")
+    @myshixun.update_attributes!(myshixuns_update)
     gitUrl = repo_ip_url @myshixun.repo_path
+
     logger.info("#############giturl: ##{gitUrl}")
     gitUrl = Base64.urlsafe_encode64(gitUrl)
 
diff --git a/public/react/src/modules/courses/exercise/new/SingleDisplay.js b/public/react/src/modules/courses/exercise/new/SingleDisplay.js
index 453cce229..b7a1905fc 100644
--- a/public/react/src/modules/courses/exercise/new/SingleDisplay.js
+++ b/public/react/src/modules/courses/exercise/new/SingleDisplay.js
@@ -54,7 +54,7 @@ class SingleDisplay extends Component{
   }
   render() {
     let { question_title, question_score, question_type, question_choices, standard_answer,
-        question_id, question_number, index, displayCount
+        question_id, question_number, index, displayCount, showActionButton
      } = this.props;
     
     // const { getFieldDecorator } = this.props.form;
@@ -70,6 +70,9 @@ class SingleDisplay extends Component{
     // const answerTagArray = standard_answer.map((item, index) => { return item == true ? tagArray[index] : -1 }).filter(item => item != -1);
     let length = 5;
     const qName = qNameArray[question_type]
+
+    const isPreviewPage = showActionButton == false
+   
     return(
         <div className="bor-bottom-greyE padding20-30 singleDisplay" id={qNumber} _id={question_id}>
             <style>{`
@@ -89,20 +92,24 @@ class SingleDisplay extends Component{
             {/* 单选 or 多选 */}
             <div className="options">
                 { question_choices.map((item, optionIndex) => {
+                  let prefix = undefined
+                  if (!isPreviewPage) {
+                    prefix = `${tagArray[optionIndex]}.`
+                  }
                   if (question_type == 0) { // 单选
                     return (
                         <div className="mb10 clearfix" key={optionIndex}>
-                            <Radio disabled className="fl lineh-20" checked={item.standard_boolean}></Radio>
+                            <Radio disabled className="fl lineh-20" checked={item.standard_boolean}>{prefix}</Radio>
                             <span style={{ display: 'inline-block'}} className="markdown-body fl"
-                                    dangerouslySetInnerHTML={{__html: markdownToHTML(item.choice_text)}}></span>
+                                    dangerouslySetInnerHTML={{__html:  markdownToHTML(item.choice_text)}}></span>
                         </div>)
                   } else {
 
                     return (
                         <div className="mb10 clearfix" key={optionIndex}>
-                            <Checkbox  disabled className="fl lineh-20" checked={item.standard_boolean}></Checkbox>
+                            <Checkbox  disabled className="fl lineh-20" checked={item.standard_boolean}>{prefix}</Checkbox>
                             <span style={{ display: 'inline-block'}} className="markdown-body fl"
-                                    dangerouslySetInnerHTML={{__html: markdownToHTML(item.choice_text)}}></span>
+                                    dangerouslySetInnerHTML={{__html:  markdownToHTML(item.choice_text)}}></span>
                         </div>)
                   }
                 })}