题目内容

—What does the sign over there read?
—"No person_______ smoke or carry a lighted cigarette, cigar or pipe in this area．"
A．shallB．mayC．mustD．Will
A
四个选项用在第三人称后分别表示应该/可以/必须一定/和将要，根据题意选A，谁都不应该在这个地方吸烟或者携带点燃的香烟，雪茄或者烟斗。
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