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— Has Jack finished his homework yet?

   — I have no idea;he __it this morning.

A. was doing    B. had been doing    C. has done      D. did

A


解析:

题干没有构成“过去的过去”,不可选B。如选C、D则表示动作已完成,与have no idea相矛盾。过去进行时表示过去某段时间或某一时刻正在进行的动作,不涉及结果,正好附合题干语境。

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