.---I didn't go to work yesterday because my car broke down.
---You mine. I wasn't using it then.
A. might borrow
B. could have borrowed
C. must have borrowed
D. ought to borrow
网友回答
A. might borrow
(答案→)B. could have borrowed
C. must have borrowed
D. ought to borrow
解析：该题考查虚拟语气的用法。从句意:“你本来是可以用我的车子，因我当时不用它，而你未用，”可知该空表示的是与过去事实相反的假设。用could have done。