(經(jīng)典回放)－Has Sam finished his homework today?

－I have no idea．He ________ it this morning．

[　　]
A．

did

B．

has done

C．

was doing

D．

had done

答案：C
解析：

此題語境設(shè)計非常精彩，句意是：“Sam做完作業(yè)了嗎?”“我不知道。他今天早晨正在做�！北绢}考查的是過去某個時間正在做的事情，所以選擇C項。


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