单项选择题

Our country is trying to ________ the serious problems created by the environment pollution.

A．comply with
B．cope with
C．cope to
D．comply to
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单项选择题
It was requested that all of the equipment ________ in the agreed time.
A．erected
B．would be erected
C．be erected
D．will be erected
单项选择题
I ________ him the Christmas gift by mail because he came home during the Christmas holidays.
A．ought to have sent
B．couldn’t have sent
C．must have sent
D．needn’t have sent
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