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單項(xiàng)選擇題

The young motorman as well as the others （）to operate the oil separator.

A.has learnt
B.have learnt
C.learn
D.are learning

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單項(xiàng)選擇題

No sooner （） than they started to repair the sludge pump.

A.the second engineer had got into the engine room
B.the second engineer got into the engine room
C.has the second engineer got into the engine room
D.did the second engineer get into the engine room

單項(xiàng)選擇題

（）the moveable plate and floating ring inside the pump is very difficult.

A.Having adjusted
B.Being adjusted
C.To adjust
D.Adjusted

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