People begin to know that most environmental problems exist because necessary measures for preventing them _____taken in the past. [ ]A. are not B. were not C-高中英语-魔方格

◎ 题干

People begin to know that most environmental problems exist because necessary measures for preventing them _____ taken in the past.

A. are not
B. were not
C. hadn't been
D. wouldn't be

◎ 答案

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◎ 解析

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◎ 知识点

根据魔方格专家分析，试题“People begin to know that most environmental problems exist because necessary measures for preventing them _____taken in the past. [ ]A. are not B. were not C…”主要考查了你对【一般过去时的被动语态】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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与“People begin to know that most environmental problems exist because necessary measures for preventing them _____taken in the past. [ ]A. are not B. were not C”考查相似的试题有：

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