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單項(xiàng)選擇題

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

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

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單項(xiàng)選擇題

It was demanded that the injured crewmembers（）at once.

A.was treated
B.would be treated
C.being treated
D.be treated

單項(xiàng)選擇題

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