题目

You __ drive your car so fast. It's very dangerous.A. wouldn't B. shouldn't C. couldn't D. mightn't 答案：【答案】B【解析】情态动词之间最大的区别就是表达语气的不同. wouldn't不会;shouldn't不应该;couldn't不能; mightn't不可能,表示否定性推测.句意:你不应该开车这么快.太危险了.结合语境可知选B.—I'm sorry. That wasn't of much help.—Oh, ________. As a matter of fact, it was most helpful. [     ]A. sure it was  B. it doesn't matterC. of course not  D. thanks anyway