单项选择题

He was taken away by the police. He _______ for a thief.

A．must mistake
B．must be mistaken
C．must have been taken
D．must have mistaken
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单项选择题
-- _______ progress you have made this year, Xian Li!--Thank you. But I have a long way to go.
A．What a good
B．How rapid
C．What great
D．How big
单项选择题
The bus passed through the street _______ we thought was a very dangerous speed.
A．which
B．at which
C．what
D．at what
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