单项选择题

A couple of minutes earlier,（）we could have been able to hear his speech.

A．and
B．on
C．but
D．so

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单项选择题
When we reached the pier, the ferry had not arrived yet; so we（）

A．needed not to hurry
B．needn' t have hurried
C．didn't need to hurry
D．had not needed to hurry
单项选择题
The city' s underground（）more people than the buses.

A．brings
B．carries
C．sends
D．fetches
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