Question

为什么选C I would have helped John _________ me about his problem.A. if had

Answer 1

表示与过去事实相反的虚拟语气。

希望能帮到你，祝更上一层楼O(∩_∩)O
有不会的欢迎再继续问我(*^__^*)

Answer 2

I would have helped John _________ me about his problem.
A. if had he told B. if he had tell C. had he told D. told he
答案 C
这是一个省略了IF的条件句，如果还原回去，应该是，if he had told me about his problem

if 条件中:
对过去的假设，if 条件句中用过去完成时
主句用would /could /...have done

Answer 3

你的答案给的不全啊~