fixbug

app/controllers/exercise_questions_controller.rb

@@ -680,7 +680,7 @@ class ExerciseQuestionsController < ApplicationController
         normal_status(-1,"已发布/已截止，不允许增删答案！")
       elsif standard_answer.present?
         if @exercise_question.question_type == Exercise::COMPLETION
-          exercise_answers_text = standard_answer.map{|a| a[:answer_text]}.sum.uniq
+          exercise_answers_text = standard_answer.map{|a| a[:answer_text]}.sum
           unless (standard_answer.count == exercise_choice_ids.count) && (standard_answers_text.count == exercise_answers_text.count)
             normal_status(-1,"已发布/已截止，不允许增删标准答案！")
           end