单项选择题

The horse is getting old and cannot run ______ it did.

A．as fast as
B．as faster as
C．as faster than
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单项选择题
Today his room is ______ as usual.
A．so dirty
B．as dirty
C．more dirty
单项选择题
The hills will be covered with young trees ______ a few years' time.
A．in
B．after
C．during
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