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题目内容 （请给出正确答案）
单选题
If we _____ the oil company to build this paper mill, we _____ water pollution now.
A

had not allowed, would not have

B

had not allowed, would not have had

C

didn’t allow, would not have

D

didn’t allow, would not have had

参考答案

参考解析
解析：
句意：如果当初我们不允许石油公司建造这个造纸厂，今天就不会出现水污染的问题了。从句是对过去事实的虚拟，用过去完成时：情态动词＋动词过去分词。主句是对现在事实的虚拟，用would＋be/动词原形结构。
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