◎ 题干

— 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
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“— Everyone in my class passed the exam. — Oh, really? It _____difficult. [ ]A. can't have been B. needn't have been C. must beD. mightn't be …”主要考查了你对  【情态动词】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。