Given more attention,the trees could have grown better.中为什么不能用Having given?

问题描述:

Given more attention,the trees could have grown better.中为什么不能用Having given?

Given more attention在这里相当一个条件壮语从句.可改写为If it had been given more attention,the trees could have grown better.此句是针对过去的虚拟语气,从句If it had been given more attention时态用过去...