—Look, Mr. King is swimming in the pool. —It ________ be Mr. King. He has gone to Kunming on vacatio
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题目简介
—Look, Mr. King is swimming in the pool. —It ________ be Mr. King. He has gone to Kunming on vacatio
题目详情
—It ________ be Mr. King. He has gone to Kunming on vacation.
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B. can't
C. must
D. mustn't
答案