I．用适当语法形式或词汇填空。从A、B、C、D四个选项中选出一个最佳答案，并将所选答案的字母写在答题纸相应的位置上。(本大题共20小题，每小题1分，共20分)
1. I didn’t see Jack at the meeting yesterday afternoon. He ______ it.
A. mustn’t attend
B. can’t attend
C. mustn’t have attended
D. can’t have attended
2. It is essential that this application form ______ as soon as possible.
A. being returned
B. be returned
C. to be returned
D. will be returned
3. You ______ quit your job until you find another one.
A. had better not
B. had better not to
C. had not better
D. had not better to
4. There are more than sixty proposals ______ at the conference.
A. discussing
B. been discussed
C. to discuss
D. to be discussed
5. ______ for their help, we couldn’t have finished the task ahead of time.
A. If it were not
B. Hadn’t it been
C. Had it not been
D. If it was not
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