单项选择题

I'm at my wits' end. Tell me _______ to do.

A．how
B．what
C．when
D．why
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单项选择题
I can't give you that for nothing, what do you take me _______
A．up
B．for
C．to
D．after
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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