问题
单项选择题
"You realize that you were driving at 100mph, don't you " "No, officer, I may not have been. This car can't do more than 80."
A．will not
B．cannot
C．might not
D．could not
答案
参考答案：D
解析：[分析] 情态动词应用 在此因表过去不大可能发生的事，应用couldn't+have+过去分词；因此D为答案。