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题文

Listen! I think it____ be Mr. White singing in the office.

No, it ___ be him. He left for London just now.(  )

A.

must; mustn't

B.

may; mustn't

C.

must; can't

D.

can; can

科目 英语   题型 选择题   难度 中等
知识点: 情态动词
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