单项选择题

My computer isn't working. It______.

A．need repairing
B．needs repairing
C．need to repair
D．need to be repaired
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单项选择题
You'd better ______ your computer before you use it again.
A．observe
B．begin
C．check
D．pick
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
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