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 not unusual for workers in that region______.
A．to be paid more than a month late
B．to be paid later than more a month
C．to pay later than a month more
D．to pay late more than a month
单项选择题
______we can't get the necessary equipment, what shall we do
A．Since
B．Supposing
C．As long as
D．In case
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