单项选择题

A man escaped from the prison last night. It was a long time ______ the guards discovered what had happened.

A．before
B．until
C．since
D．when
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单项选择题
It is ______ of him to put everything in disorder in the room. He is so peculiar.
A．unconscious
B．aware
C．typical
D．unkind
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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