I dressed very warmly for the trip,but I___so.The weather was hot.

题目

I dressed very warmly for the trip,but I___so.The weather was hot.
a.needn't do
b.needn't have done
c.can't have done
d.shouldn't have done
要解释哪个选项正确,为什么是对的?

答案

B.1.翻译：这次旅行我穿得很暖和,但是我本不必如此.天气（其实）很热.2.选项所在句是对过去的动作进行虚拟,所以须用情态动词的完成形式,先可排除A； b.needn't have done 本不必做某事（实际做过了） c.can't have d...