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 people, 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
All the children were well mannered and ______ toward the guests.
A．respecting
B．respective
C．respectable
D．respectful
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