单项选择题

All _______ is a continuous supple of raw materials.

A．what is needed
B．thing needed
C．that is needed
D．is needed
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单项选择题
Could you lend me the bestseller when you get______ it
A．by
B．over
C．through
D．on
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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