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
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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
单项选择题
I ______ to speak to you all these days.
A．wanted
B．have wanted
C．shall want
D．shall be wanting
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