单项选择题

You'd better ______ your computer before you use it again.

A．observe
B．begin
C．check
D．pick
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单项选择题
With the electricity______, all the machines stopped.
A．cut off
B．cut down
C．was cut off
D．was cut down
单项选择题
Since there isn't much time left, you can just make the report______.
A．in detail
B．in short
C．in all
D．in brief
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