Question

----I missed the first part of the film. It was really a pity．
----You _____home half an hour earlier

1. A.
   should have left　
2. B.
   must have left
3. C.
   should leave　　　
4. D.
   must leave

Answer 1

A
试题分析：句意：--- 我没看到电影的开头，真是可惜啊。--- 你本应该早半小时从家里出发。should have done 表示“过去本应该做某事却未做。”must have left表示一定离开了。表示对过去的推测，C和D都是对现在的推测，排除。故选A。
考点：考查情态动词表推测的用法。