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Most environmental problems exist because adequate measures for preventing them_
Most environmental problems exist because adequate measures for preventing them_
游客
2023-10-21
69
管理
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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