diff --git a/Tiobon.Core.Services/Ghre/Ghre_ExamRecordServices.cs b/Tiobon.Core.Services/Ghre/Ghre_ExamRecordServices.cs
index 9cbe95b6..a3156c49 100644
--- a/Tiobon.Core.Services/Ghre/Ghre_ExamRecordServices.cs
+++ b/Tiobon.Core.Services/Ghre/Ghre_ExamRecordServices.cs
@@ -640,7 +640,7 @@ public class Ghre_ExamRecordServices : BaseServices<Ghre_ExamRecord, Ghre_ExamRe
                 if (config.QuestionId != null)
                     sql += $" AND Id='{config.QuestionId}'";
                 if (examPaperQuestionIds.Any())
-                    sql += $" AND Id NOT IN ('{string.Join(",", examPaperQuestionIds)}')";
+                    sql += $" AND Id NOT IN ({string.Join(",", examPaperQuestionIds)})";
 
                 sql += $" ORDER BY GuidValue ASC";
                 var questions2 = await Db.Ado.SqlQueryAsync<Ghre_Question>(sql);