单项选择题

It’s not advisable to cut（）the power supply.

A.out
B.off
C.down
D.away

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单项选择题
It was demanded that the injured crewmembers（）at once.

A.was treated
B.would be treated
C.being treated
D.be treated
单项选择题
It is NOT advisable to use nylon for alongside towing because it（）.

A.stretches too much
B.is too difficult to make fast
C.parts too readily
D.is too susceptible to mildew
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