【正确答案】 A

【答案解析】be supposed to have done sth．作“本应该做某事”讲，相当于should have done，可以算是一种特殊的虚拟语气，表示过去本应该做而实际未做的事情，例如：The problemof storing the sun’s heat is supposed to have been studied by scientists all over the world．大家都认为贮存太阳热能的问题已为全世界的科学家研究过了。You are supposed to have beenhere one hour ago．你们一个小时前就该在这里。