单项选择题

A business letter should be written in a formal style ______ in a personal one.

A．better than
B．rather than
C．other than
D．less than
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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
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
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