—Has Jack finished his homework yet?—I have no idea; he______it this morning.

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问题 —Has Jack finished his homework yet?—I have no idea; he______it this morning.

选项 A、was doing
B、had been doing
C、has done
D、did

答案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，正好符合题干语境。

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