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—Everyone in my class passed the exam. —...

—Everyone in my class passed the exam.

—Oh, really? It ________ difficult.

A. can’t have been             B. needn’t have been

C. must be                   D. mightn’t be

 

A 【解析】 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。 考点:考查情态动词的用法。
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