单选Most environmental problems exist because adequate for preventing them __ takeen in the past.A.was not B.were not being C.were not D.being not答案怎么不是B?

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单选Most environmental problems exist because adequate for preventing them __ takeen in the past.A.was not B.were not being C.were not D.being not答案怎么不是B?

单选Most environmental problems exist because adequate for preventing them __ takeen in the past.A.was not B.were not being C.were not D.being not答案怎么不是B?
单选Most environmental problems exist because adequate for preventing them __ takeen in the past.
A.was not B.were not being C.were not D.being not
答案怎么不是B?

单选Most environmental problems exist because adequate for preventing them __ takeen in the past.A.was not B.were not being C.were not D.being not答案怎么不是B?
这句话的意思是：大多数环境污染问题的存在是因为充分预防措施在过去没有被重视.
首先这个句子的重点是~预防措施没【被】重视,所以答案一定要体现【被动】
句意是说污染问题还在是因为 【过去】防护措施 没被重视,而不是【过去某个时刻】没被重视,所以排除B,D
注意：（were being+过去分词 表示过去进行时的被动语态.如The builidings were being built this time last year.这些大楼去年的这个时候正在修建.）
（being not done不成结构,必须是 be being not done)
又因为是them 复数 所以选C

动词应该用单数而不是复数吧

排出B \D 的原因就是楼上说的那样。
不过这题目少了个名词，adequate后面的名词是单数还是复数，决定了用was还是用were。这是模拟卷 可是真的是却了个词。楼上说的是因为them吗？不是因为them，这个them指的是Most environmental problems。它是preventing的宾语，不是because后面那个句子的主语。 后半句主干应该是because a...

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排出B \D 的原因就是楼上说的那样。
不过这题目少了个名词，adequate后面的名词是单数还是复数，决定了用was还是用were。

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