--- Hi, Grandma, why do you look so tired? --- I’m tired. I _______ the cleaning all morning.
A．did
B．had done
C．have been doing
D．have 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“ --- Hi, Grandma, why do you look so tired? --- I’m tired. I _______ the cleaning all morning.A．didB．had doneC．have been doingD．have done…”主要考查了你对 【一般现在时】，【将来进行时】，【过去完成进行时】，【过去将来时的被动语态】 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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