diff --git a/app/controllers/exercise_questions_controller.rb b/app/controllers/exercise_questions_controller.rb
index dccdae809..8c3a04f61 100644
--- a/app/controllers/exercise_questions_controller.rb
+++ b/app/controllers/exercise_questions_controller.rb
@@ -255,8 +255,8 @@ class ExerciseQuestionsController < ApplicationController
             end
           elsif @exercise_question.question_type == Exercise::COMPLETION  #填空题
             old_ex_answer = @exercise_question.exercise_standard_answers  #当前问题的全部标准答案
-            old_ex_answer_choice_texts = old_ex_answer.pluck(:answer_text).uniq.sort
-            new_ex_answer_choice_texts = standard_answer.pluck(:answer_text).sum.uniq.sort
+            old_ex_answer_choice_texts = old_ex_answer.pluck(:answer_text).sort
+            new_ex_answer_choice_texts = standard_answer.pluck(:answer_text).sum.sort
             if old_ex_answer_choice_texts != new_ex_answer_choice_texts  #填空题标准答案有更改时，才会更新标准答案
               new_ex_answer_choice_ids = standard_answer.map {|a| a[:choice_id]}.uniq   #新传入的答案数组序号
               old_ex_answer_choice_ids = old_ex_answer.pluck(:exercise_choice_id).uniq   #全部的答案数组序号