问题补充:
----I missed the first part of the film. It was really a pity.
----You home half an hour earlier.
A. should have left
B. must have left
C. should leave
D. must leave
答案:
(答案→)A. should have left
B. must have left
C. should leave
D. must leave
解析: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。