diff --git a/monitor.py b/monitor.py
index a221f69..ae8704f 100644
--- a/monitor.py
+++ b/monitor.py
@@ -699,12 +699,17 @@ class MessageHistory:
         self._ensure_user_messages_table()
         conn = self._get_conn()
         try:
+            # ⭐ Task #1704: 只查询最近一条匹配消息的reply_status
+            #   问题：多条相同内容消息时，只要有一条状态为0就跳过所有
+            #   修复：只检查最近一条匹配消息的状态
             cursor = conn.execute(
-                """SELECT COUNT(*) FROM user_messages
-                WHERE platform=? AND content=? AND reply_status=0""",
+                """SELECT reply_status FROM user_messages
+                WHERE platform=? AND content=?
+                ORDER BY id DESC LIMIT 1""",
                 (platform, content.strip())
             )
-            return cursor.fetchone()[0] > 0
+            row = cursor.fetchone()
+            return row is not None and row[0] == 0
         except Exception as e:
             logger.error(f"[{platform}] 检查消息是否已回复失败: {e}")
             return False