二. 单项选择:(每小题1分; 共15小题; 满分15分)
21.—May I use your computer?
—Sure, _____________
A. cheer up B. come on C. go ahead D. nothing
22. It was __________ you had done ________made it possible for you to improve
your English.
A. that/ that B. that / what C. what/ what D. what/ that
