◎ 题干
—Is that man in a red T-shirt Mr. Smith, your math teacher?
—It _______ be Mr. Smith. He has gone back to America.

[     ]

A. must
B. can
C. shouldn't
D. can't
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“—Is that man in a red T-shirt Mr. Smith, your math teacher?—It _______ be Mr. Smith. He has gone back to America.[ ]A. must B. can C. shouldn't D. can'…”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。