2. 外语
  3. Most environmental problems exist because adequate measures for preventing them________taken in the past.

Most environmental problems exist because adequate measures for preventing them________taken in the past.

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问题 Most environmental problems exist because adequate measures for preventing them________taken in the past.
选项 A、was not
B、were not
C、were not being
D、being not
答案B
解析 大多数环境问题存在的原因是过去没有采取适当的预防措施。主谓一致题。该句的主句是Most environmental problems exist，其后的because引导原因状语从句。在这个从句中，主语是measures，为复数，所以排除A项选项；另外，原因状语从句中缺少谓语部分，故排除不能作谓语的D项；C项选项为过去进行时，与句意不符，故排除，所以B为正确答案。
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