单项选择题

We read the newspaper every day to ______ the present affairs.

A．keep up
B．keep up with
C．catch up with
D．keep in touch with
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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
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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