单项选择题

The service in this restaurant is very poor; there are not enough waiters to wait ______ customers.

A．on
B．for
C．with
D．to
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单项选择题
We will not attack ______ we are attacked; if attacked, we will certainly counter-attack.
A．if
B．when
C．unless
D．even if
单项选择题
Peter, John and Tom each ______.
A．say they came first
B．says they came first
C．says he came first
D．say came first
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