单项选择题

______ you don't know the rule won't be a sufficient excuse for your failure.

A．It is
B．That
C．Because
D．What
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单项选择题
It turned out that the man was an excellent policeman working in New York, ______ had contributed a lot to the case.
A．that
B．which
C．who
D．where
单项选择题
Before the guests come, I must get the glasses ______.
A．washed
B．to be washed
C．being washed
D．to wash
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