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(经典回放)-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:

此题语境设计非常精彩,句意是:“Sam做完作业了吗?”“我不知道。他今天早晨正在做。”本题考查的是过去某个时间正在做的事情,所以选择C项。


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