单项选择题

The new model of the car was put into production in 2007, ______ helped to provide another 1400 jobs.

A．that
B．when
C．what
D．which
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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
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
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