单项选择题

We couldn't have passed the final examination ______ your help.

A．but for
B．without
C．if it had not been for
D．All of the above.
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单项选择题
Last month he promised that he ______ today, but he hasn't arrived yet.
A．will come
B．would have come
C．would come
D．is coming
单项选择题
In vain ______ try to persuade her to change her plan.
A．we did
B．did we
C．we would
D．would we
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