单项选择题

As fuel prices rose, bus companies raised their fares, and ______.

A．so did the airlines
B．neither did the airlines
C．so did the airlines have done
D．neither the airlines did
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单项选择题
Water pollution, together with old tins and other forms of garbage, ______ many problems in our large, industrial city today.
A．is causing
B．have caused
C．have been causing
D．are caused
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
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