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    精英家教网 > 高中英语 > 题目详情
    —Everyone in my class passed the exam.
    —Oh, really? It ________ difficult.
    A．can’t have beenB．needn’t have been
    C．must beD．mightn’t be
    A

    试题分析：句意：——在我班学生考试都及格了。——哦,真的吗?它一定不难。can’t have been 过去不可能，有把握的推测；needn’t have been 过去本没有必要； must be现在或将来一定，有把握的推测；mightn’t be可能不，没有把握的推测；根据句意每个人考试都及格了，可知考试不难，这是有把握的推测。故选A。
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