单项选择题

Many cities in the southern part of the United States have difficulty ______ traffic flowing when it snows.

A．kept
B．keeping
C．to keep
D．in being kept
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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
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
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