A. studied B. studying
C. to have studied D. to be studying
A. lost B. having lost C. losing D. having loss
A. did we B. didn't we C. dared we D. daren't we
A. mustn't they B. haven't they C. didn't they D. hadn't they
A. should he B. shouldn't he C. would he D. wouldn't he
A. shall I B. may I C. do I D. will I
A. dare he B. daren't he C. does he D. doesn't he
A. will you B. shan't you C. do you D. don't you
A. shall we B. will you C. do you D. do we
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