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Most environmental problems would not exist if adequate measures______to prevent
Most environmental problems would not exist if adequate measures______to prevent
游客
2023-10-01
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问题
Most environmental problems would not exist if adequate measures______to prevent them in the past.
选项
A、are taken
B、was taken
C、have been taken
D、had been taken
答案
D
解析
本题同时考查被动语态和虚拟语气两个知识点。if从句中的时间状语是in the past,表示从句的时态为一般过去时。表示与过去事实相反的情况时,从句谓语动词应该使用“had+过去分词”结构。另外,从句的主语measures和动词take之间存在逻辑上的被动关系,因此需要使用被动语态。结合以上分析,可以确定答案为had been taken,由此确定D)为本题的答案。
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