单项选择题

He looks as if he______nothing about the news.

A．would know
B．would have known
C．knew
D．should know
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单项选择题
A fire______during the night and a large number of houses______to ashes.
A．broke out: were burnt
B．was broke out: were burnt
C．broke out: burnt
D．set out: were burned
单项选择题
He came back late, ______which time all the guests had already left.
A．at
B．after
C．by
D．during
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