— Has Sam finished his homework today?— I have no idea. He ________ it this morning.A．didB．was doingC．has doneD．had done-高中英语-n多题

◎ 题干

— Has Sam finished his homework today?　　
— I have no idea. He ________ it this morning.　　

A．did

B．was doing

C．has done

D．had done

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◎ 解析

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◎ 知识点

根据n多题专家分析，试题“— Has Sam finished his homework today?— I have no idea. He ________ it this morning.A．didB．was doingC．has doneD．had done…”主要考查了你对【动词短语】，【动词】等知识点的理解和应用能力。关于这些知识点的“档案”，你可以点击相应的链接进行查看和学习。

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