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C,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B
environmental problems exist because adequate measures for preventing them
environmental problems exist because adequate measures for preventing them
Most environmental problems exist because adequate measures for preventing them_ taken in the past.
A.was not
B.were not
C.were not being
D.being not
想问问其他为什么不选呢?
Most environmental problems exist because adequate measures for preventing them_ taken in the past.
A.was not
B.were not
C.were not being
D.being not
想问问其他为什么不选呢?
英语人气：988 ℃时间：2020-02-04 06:20:07
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