题目内容：
18. Mary couldn’t open the front door because she ______ the key.A. has forgotten B. was forgetting C. had forgotten D. forgets
参考答案：
选择题：18. Mary couldn’t open the front door because she
- 题目分类：新疆师范大学2021级学生第一学期结业课程考试《大
- 题目类型：选择题
- 查看权限：VIP
A. has forgotten B. was forgetting C. had forgotten D. forgets