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. —What are you planning to do in the future ?
—No idea. After all, I still have three terms to go _____ I graduate.
A. if B. though C. since D. before
22. Shortly after we _____, a waiter came over to our table with a smile.
A. seated B. were seated C. sat ourselves. D. take place
23. —Go and ask her ____ come.
—OK.
A. What time would she like to B. at what time she’d like to
C. when would she like to D. when she likes to高考资源网版权所有 ©2005-2009
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