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單項選擇題

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

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

單項選擇題

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

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Before dismantling the pipe, would you （）the oil retained in the hose with （）?

你可能感興趣的試題

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

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