—You know that you were driving at 100 kilometers per hour, don’t you?
—No, officer, I have been. This car can’t do more than 80.
A. mustn’t
B. shouldn’t
C. may not
D. couldn’t
网友回答
A. mustn’t
B. shouldn’t
C. may not
(答案→)D. couldn’t
解析：本题考查情态动词的用法。从句意可知那个驾驶员在听了交警对他的控告后作出辩解“这是不可能的，我的车时速超不了80公里”，表示对过去的事做出否定推测用couldn’t have done。