—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

試題分析：句意：——在我班學生考試都及格了�！�,真的嗎?它一定不難。can’t have been 過去不可能，有把握的推測；needn’t have been 過去本沒有必要； must be現(xiàn)在或?qū)硪欢�，有把握的推測；mightn’t be可能不，沒有把握的推測；根據(jù)句意每個人考試都及格了，可知考試不難，這是有把握的推測。故選A。
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