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If you _____ smoke, please go outside because this is a non-smoking office.
A.mustB.shouldC.canD.may
A
考查情态动词。句意“如果你非要吸烟,请你去外边吸,因为这是无烟办公室。”must可表示“一定,非得,非要”的意思,故选A。
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