试题题干
Fill in the blanks with an item as required.
With a modal auxiliary:
— You realize that you were driving at 100 mph, don't you？
— No, officer. I
have been. This car can't do more than 80.
参考答案
试题解析
本题考查情态动词。由driving at 100 mph和can't do more than 80，可推测刚才开车不可能达到100，因为这个车最快是80。couldn't have done 过去不可能做了某事。
句意：—— 你意识到你在以每小时100英里的速度开车，不是吗？
—— 不，警官。这不可能的。这辆车不能超过80。