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第一节 单项填空（共15小题，每小题1分，满分15分）
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21. - ______, I am tied up all day.
- Ten o\'clock sharp. Don\'t worry, they are probably caught in traffic.
A. What time is it, please? B. What time is it now?
C. How are they doing for time? D. Do they have some time?
从A、B、C、D四个选项中，选出可以填入空白处的最佳选项。
21. - ______, I am tied up all day.
- Ten o\'clock sharp. Don\'t worry, they are probably caught in traffic.
A. What time is it, please? B. What time is it now?
C. How are they doing for time? D. Do they have some time?
