By the time he got up, I ______ for two hours in the factory.
A．have workedB．workedC．was workingD．had been working
D

試題分析：考查時態(tài)。本題的關(guān)鍵詞是by，該詞通常與完成時連用，句意：到他起床的時候，我已經(jīng)在工廠里工作了兩個小時了。他起床使用了過去時got up，我工作兩個小時是在此之前，故使用了過去完成進行時的時態(tài)。故D正確。
點評：連詞by到…時為止；該詞經(jīng)常與完成時連用，如果后面是現(xiàn)在的時間，句中就使用現(xiàn)在完成時；如果后面是過去的時間，就使用過去完成時；如果后面是將來的時間，就使用將來完成時。
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