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单项填空（共25题，每小题1分，满分25分）
21. Be careful not to drive so fast, ________ you will be fined by the police.
A. and B. so C. till D. or
22----You were brave enough to raise objections(反对意见) at the meeting.
----Well, now I regret ______ that.
A. to do B. to be doing C. to have done D. having done
21. Be careful not to drive so fast, ________ you will be fined by the police.
A. and B. so C. till D. or
22----You were brave enough to raise objections(反对意见) at the meeting.
----Well, now I regret ______ that.
A. to do B. to be doing C. to have done D. having done
