. The reason for all the changes being made _______to us yet.A．has not explainedB．has not been explainedC．did not explainedD．were not explained-高中英语-n多题

◎ 题干

. The reason for all the changes being made _______to us yet.

A．has not explained	B．has not been explained
C．did not explained	D．were not explained

◎ 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“. The reason for all the changes being made _______to us yet.A．has not explainedB．has not been explainedC．did not explainedD．were not explained…”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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