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  3. —Has Torn finished his homework? —I have no idea; he______it this morning.

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

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问题 —Has Torn finished his homework? —I have no idea; he______it this morning.
选项 A、was doing
B、had been doing
C、had done
D、did
答案A
解析 该题测试动词时态的用法。题干中的时间状语this morning是解题的关键。使用过去进行时不表示动作的完成，故选用选项A与其前的I have no idea配合。
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