一道英语单选题,

题目

一道英语单选题,
Had I had the time .I _______you .but I _________really occupied the whole week .
A.would help ,had been
B.would have helped ,was
C.helped .have been
D.should have helped ,must be
应该选哪个?为什么?

答案

选B先看这句 ：Had I had the time .相当于 ：If I had had the time ,这个从句用的是过去完成时(had done),主句要用would have done,直接可以判断选B了在看后一个空,有个关键词 but ,在虚拟语气中,看到but 要记住后...