题目内容：

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

优质解答

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....

追问：

为什么作为定语从句的省略，要用ing

追答：

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.)