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
He asked her to go to a concert with him but she ______ his invitation _____ politely.
A．turned; down
B．turned; out
C．turned; away
D．turned; up
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
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