―Look! What a mistake! Why?―Sorry, I _________ on it.A．don’t concentrateB．hadn’t concentratedC．haven’t been concentratingD．wasn’t concentrating-高中英语-n多题

◎ 题干

―Look! What a mistake! Why?
―Sorry, I _________ on it.

A．don’t concentrate	B．hadn’t concentrated
C．haven’t been concentrating	D．wasn’t concentrating

◎ 答案

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◎ 解析

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◎ 知识点

根据n多题专家分析，试题“―Look! What a mistake! Why?―Sorry, I _________ on it.A．don’t concentrateB．hadn’t concentratedC．haven’t been concentratingD．wasn’t concentrating…”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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