單項(xiàng)選擇題

Ropes can be divided into （）basic types.

A.3
B.4
C.5
D.6

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單項(xiàng)選擇題

It is very important for every sailor （）the characteristics of the ropes so that they can be for right jobs.

A.knowing
B.know
C.to know
D.knew

單項(xiàng)選擇題

This windlass （）now.

A. has repaired
B. is under repair
C. was repaired
D. had repaired