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More highways have been built in China,making it much easier

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More highways have been built in China,making it much easier for people to travel from one place
to another..
为什么用having
句意:更多公路在中国建成,使得人们从一地到另一地变得更方便.Making为定语从句的省略,等于
More highways have been built in China,which makes it much easier for people to travel from one place to another.
再问: 为什么作为定语从句的省略,要用ing
再答: 前一句表达的“更多公路在中国建成”的事实是make的逻辑主语,关系为主动,故省略后用ing形式表达主动;如果前后关系为被动,则可以用动词过去分词形式:The cake made by grandma tastes really good.(= The cake which was made by grandma tastes really good.)