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If you _____ smoke, please go outside.
A.canB.mayC.mustD.might
C

试题分析:句意:如果你必须要吸烟的话,请到外面去吸。can 能,会;may 可以,可能;must 必须,非要;might 可以,可能,是may的过去式形式。根据句意可知,这里表示的是如果你非得要吸烟这个意思,故选C。
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