—Is that man in a red T-shirt Mr. Smith, your math teacher?—It _______ be Mr. Smith. He has gone bac
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题目简介
—Is that man in a red T-shirt Mr. Smith, your math teacher?—It _______ be Mr. Smith. He has gone bac
题目详情
—It _______ be Mr. Smith. He has gone back to America.
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B. can
C. shouldn't
D. can't
答案