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
_______ has recently been done to provide more flats for the propel, the housing problem in this city is still very serious
A．What
B．That
C．As a matter of fact
D．In spite of what
单项选择题
One of the requirements for a fire is that the material _______ to its burning temperature.
A．is heated
B．will be heated
C．be heated
D．would be heated
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