fix: 复核隐藏选择小题

src/features/mark/toolbar/MarkTool.vue

@@ -140,7 +140,10 @@
     </div>
     <div>
       <div
-        v-if="markStore.setting.questionModel === 'SINGLE'"
+        v-if="
+          checkValid('questionModel') &&
+          markStore.setting.questionModel === 'SINGLE'
+        "
         class="mark-tool-item"
         @click="toSwitchMarkingQuestion"
       >