fix: 清空题目选择列表当添加新题目时

src/views/exm/exampaper/form.vue

@@ -217,6 +217,7 @@
 	}
 	function addQuestion(titleItem) {
 		currentTitleItem.value = titleItem
+		questionPage.multipleSelection = []
 		questionPage.showDialog = true
 		search()
 	}