Now that the sign reads, “No person ______ smoke here”, please choose a seat in the smoking area over there if you _______ smoke.A.must; shallB.will; mustC.shall; mustD.can; should
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C解析考察情态动词用法。本题中的Shall表示命令，警告，强制的要求，法律规定要做；must偏偏，非得；句意：居然牌子上写着：这里不允许抽烟。如果你废要抽烟，请在那儿的吸烟室里找一个位置。