单项选择题

You had better not () there alone.

A. go
B. going
C. to go
D. went

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单项选择题
What () you do if you were me

A. do
B. did
C. would
D. can
单项选择题
They kept me () for more than an hour.

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