选择题问题修改

src/views/exercise_questions/preview/ListenSelectPreview.vue

@@ -100,7 +100,7 @@ export default {
           if (index === -1) {
             answer_list.push({ mark: parent_mark, value_list: [mark] });
           } else {
-            let mIndex = answer_list[index].value_list.findIndex((item) => item.mark === mark);
+            let mIndex = answer_list[index].value_list.findIndex((item) => item === mark);
             if (mIndex === -1) {
               answer_list[index].value_list.push(mark);
             } else {

src/views/exercise_questions/preview/SelectPreview.vue

@@ -95,7 +95,7 @@ export default {
           if (index === -1) {
             answer_list.push({ mark: parent_mark, value_list: [mark] });
           } else {
-            let mIndex = answer_list[index].value_list.findIndex((item) => item.mark === mark);
+            let mIndex = answer_list[index].value_list.findIndex((item) => item === mark);
             if (mIndex === -1) {
               answer_list[index].value_list.push(mark);
             } else {