----I missed the first part of the film. It was really a pity．----You _____home half an hour earlierA.should have left B.must have leftC.should leave D.must leave
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A解析试题分析：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。