I soon found that the work I was doing ____ by someone else — in other words, I was wasting my time.
A．had already been done
B．has already been done
C．would be done
D．have already been 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“I soon found that the work I was doing ____ by someone else — in other words, I was wasting my time.A．had already been doneB．has already been doneC．would be don…”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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