单项选择题

We could do nothing but （） till he came back.

A. to wait
B. waiting
C. wait
D. waited

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Problems like this （） every day in the factory.

A. raise
B. rise
C. get
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You have to go to work on Sundays often, （）

A. doesn't he
B. don't you
C. mustn't you
D. haven't you
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