—You know that you were driving at 100 kilometers per hour don’t you?—No officer I ha

问题补充：

—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

答案：

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。