— Has Jack finished his homework yet? — I have no idea；he ＿＿it this morning. A．was doing
—HasJackfinishedhishomeworkyet?—Ihavenoidea；he＿＿itthismorning.A．wasdoingB．hadbeendoin...
— 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
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| A |
| 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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