关于虚拟语气but for含蓄条件句的用法But for the opening policy,the situation in China _________what it is today.A would never be B will never have been C would never have been D will never be 请问：是否为错综条件句的虚拟语

Question

关于虚拟语气but for含蓄条件句的用法
But for the opening policy,the situation in China _________what it is today.
A would never be B will never have been C would never have been D will never be
请问：是否为错综条件句的虚拟语气,总所周知,the opening policy 是过去发生的事情, 主句说,不可能有今天的中国.那么今天的中国是否为时间状语从句,如果为时间状语从句,那么为什么要选择C 而不是按错综条件句的虚拟语气来看,现则A呢?表示与现在试试相反.

Answer 1

是错综条件句的虚拟从句,要根据从句的时态,判断主句相对应的时态.因为是过去某件事的发生与否,对现在造成的影响,所以要用现在完成时.在给两个例句供参考：
But for my help,she would not have passed the exam.若不是我的帮助,她就不会通过考试.But for the atmosphere plants would die.如果没有大气,植物就会死亡