if it for the snow we the moutain yesterday

题目

if it for the snow we the moutain yesterday
If it __________for the snow,we ___________the mountain yesterday.
A.were not; could have climbed B.were not; could climb
C.had not been; could have climbed D.had not been; could climb
选C为什么

答案

这是虚拟语气,此句表示与过去事实相反的假设,条件从句中用“had (not) +过去分词”形式,主句中的动词用“could/would/should+have+过去分词”的形式.这句话的意思是：如果昨天不是因为下雪,我们就能爬山了.而事实是...