单项选择题

He failed the test many times. ______, he didn’t stop trying.

A．But
B．So
C．Although
D．However
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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
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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