单项选择题

Li Ming fell ______ others in English study, but he tried his best to catch up ______ them.

A．behind, on
B．down, with
C．behind, with
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单项选择题
Don't ______ while others are speaking.
A．break up
B．break in
C．interrupt with
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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