单项选择题

President Wilson attempted to ______ between the powers to end the war, but neither side was prepared to give in.

A．segregate
B．whirl
C．compromise
D．mediate
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单项选择题
The designer has applied for a ______ for his new invention.
A．tariff
B．discount
C．version
D．patent
单项选择题
______ for a long time, the fields are all dried up.
A．There has been no rain
B．Having no rain
C．There having been no rain
D．There being no rain
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