题目内容
—Look, Mr. King is swimming in the pool.
—It ________ be Mr. King. He has gone to Kunming on vacation.
—It ________ be Mr. King. He has gone to Kunming on vacation.
[ ]
A. can
B. can't
C. must
D. mustn't
B. can't
C. must
D. mustn't
B
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