单项选择题

It will rain, ______ the barometer is falling.

A．so
B．for
C．as
D．since
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单项选择题
That ______ the case, we have to make some changes in our plan.
A．is
B．was
C．being
D．has been
单项选择题
Tom Stephen gripped the ______ wheel hard as the car bounced up and down.
A．stirring
B．driving
C．steering
D．receiving
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