单项选择题

（） no gravity, there would be no air around the earth.

A．Were there
B．Was there
C．There were
D．There be

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单项选择题

We went very often to Hyde Park （） speakers addressed the passing crowds on different subjects.

A．which
B．where
C．that
D．for

单项选择题

Many cities in the Southern part of the United States, have difficulty （） traffic when it snows.

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

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