By the time he got up I for two hours in the factory.A. have workedB. workedC. was worki

问题补充：

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

A. have worked

B. worked

C. was working

D. had been working

答案：

A. have worked

B. worked

C. was working

(答案→)D. had been working

解析：考查时态。本题的关键词是by，该词通常与完成时连用，句意：到他起床的时候，我已经在工厂里工作了两个小时了。他起床使用了过去时got up，我工作两个小时是在此之前，故使用了过去完成进行时的时态。故D正确。