单项选择题

I regret ______ you that your application has been refused.

A．being informing
B．having informed
C．to have informed
D．to inform
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单项选择题
He was unable to make much progress, hard ______ he tried.
A．unless
B．as
C．however
D．because
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
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