fix

examcloud-core-oe-student-service/src/main/java/cn/com/qmth/examcloud/core/oe/student/service/impl/ExamRecordQuestionsServiceImpl.java

@@ -204,6 +204,7 @@ public class ExamRecordQuestionsServiceImpl implements ExamRecordQuestionsServic
                 ExamQuestionTempEntity temp=of(eq);
                 examRecordQuestionTempRepo.save(temp);
                 eq.setExamQuestionTempId(temp.getId());
+                eq.setStudentAnswer(null);
             }else {
                 eq.setIsInMongo(false);
             }