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
Don't keep the boy ______ outside. It's too cold (寒冷的,伤风) there.
A． waits
B． to wait
C． waiting
单项选择题
Mary is from England. She teaches ______ English.
A． our
B． us
C． we
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