No sooner ______ than they started to repair the sludge pump.

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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

请帮忙给出正确答案和分析,谢谢!

热搜:关于氨基酸代谢错误的论述是_________。