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题目
Has he finished his homework yet?Yes,he _____ it an hour ago.
A has done B did C had done D was doing 选哪个?为什么?

提问时间:2020-08-08

答案
B
问某人是否做过某事/某事是否已发生【现在完成】
问某事何时发生的用一般过去时,夲句后面有an hour ago一般过去时的标志.
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