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By the time he got up, I for two hours in the factory. A.have worked B.worked C.

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By the time he got up, I for two hours in the factory. A.have worked B.worked C.

By the time he got up, I ______ for two hours in thefactory.

A.have worked       B.worked           C.was working       D.had beenworking

 

试题答案

【答案】

D

【解析】

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