单项选择题

An aircraft engine consists of thousands of parts, ______ plays a different role in it.

A．which
B．each of which
C．each them
D．that each of them
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单项选择题
We re busy reviewing our lessons because the terminal examination is ______.
A．at the corner
B．in the corner
C．round the corner
D．on the corner
单项选择题
It is necessary to find a peaceful ______ to the troubles in the area.
A．solution
B．answer
C．way
D．explanation
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