单项选择题

Who can it be I'm quite______a loss to guess.

A．of
B．on
C．in
D．at
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单项选择题
It was while she was sleeping in her bedroom______a thief broke into the house.
A．which
B．that
C．where
D．than
单项选择题
In fact, I would rather have left for the countryside______at home.
A．by staying
B．than staying
C．than to stay
D．than have stayed
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