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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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單項選擇題

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

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

單項選擇題

The four-stroke cycle begins with the piston （）.

A.coming up from the BDC
B.coming up from the TDC
C.coming down from the BDC
D.coming down from the TDC