单项选择题

Had you followed the doctor's advice, you would be much better now. But you ______.

A. don't
B. haven't
C. hadn't
D. didn't
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单项选择题
Doing homework ______ most of the children's spare time, so they have little time to play.
A. gives up
B. takes up
C. puts up
D. brings up
单项选择题
Thank you for giving me a hand. I ______ in the experiment without your valuable help.
A. have failed
B. will fail
C. would have failed
D. must have failed
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