【单选题】The dean of our department is supposed ______ for Florence the day before yesterday.
[A] to leave
[B] to have left
[C] to be leaving
[D] to have been left
网考网参考答案：B 网考网解析： 虚拟语气题。be supposed to have done是一种特殊的虚拟语气，相当于should have done，表示过去本应该做某件事而没有做。因此正确答案为[B]。
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