21. As soon as I ______ the tools, I shall begin with the work.
A. have B. am having C. have been having D. have been had
答案:A
22. Once you ______ the knack of it, you will have no further difficulty.
A. shall have B. had had C. are having D. have
答案:D
23. It ______ every day so far this month.
A. is raining B. rains C. has rained D. has been rained
答案:D
24. no one can prove that the earth ______ not round.
A. is being B. is to be C. is D. has been
答案:C
25. I shall tell you what he ______ at three o’clock yesterday afternoon.
A. had done B. would do C. was doing D. had been done
答案:C
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