单项选择题

There must be ____________ reason for what he has done.

A．some
B．any
C．one
D．one useful
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单项选择题
It is often easier to make a promise than to___________.
A．keep it out
B．give it out
C．break it out
D．carry it out
单项选择题
Japan is ____________ the east of China, with the Yellow Sea in between.
A．in
B．at
C．on
D．to
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