单项选择题

He was unable to make much progress, hard ______ he tried.

A．unless
B．as
C．however
D．because
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单项选择题
Under no circumstances ______ wage control while I am head of the government.
A．there will be
B．will it be
C．will there be
D．we will have
单项选择题
He was charged by the police ______ breaking the law.
A．of
B．to
C．with
D．from
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