单项选择题

It is strictly______ that access to confidential documents is denied to all but a few.

A．secured
B．forbidden
C．regulated
D．determined
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单项选择题
It finally ______me that he had been lying.
A．dwelt on
B．dawned on
C．lingered on
D．struck on
单项选择题
______for your help, we' d never have been able to get over the difficulties.
A．Had it not
B．If it were not
C．Had it not been
D．If we had not been
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