20.More highways havebeen built in China,__it much easier fo

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20.More highways havebeen built in China,__it much easier for people to travel from one place to another.A.making B.made C.to make D.having made
选D为什么不行?

making 在这里做伴随状语,是指状语从句的动作伴随主句发生,强调正在进行.而having done有动作先后性,强调已经完成.（more highways have been built 是现在完成时,所以从句应该用making）
再问：用完成时就一定要代表动作先后吗？一个句子两个完成时不行吗？用having made 为什么强调动作先后了？前面那句话不是也是完成时吗？
再答： have made 不是非谓语，这里要填非谓语动词。having made 是have made 的ing形式（非谓语形式），因为have made 是现在完成时，所以having made 在一定程度上也表示完成。
再问：两个完成时不行吗？
再答：两个完成时在有些情况也行，但这道题从句就是说现在的正在发生情况啊

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