题目内容

If you _______ spit at all. please spit in the bucket provided.
A．shallB．must C．shouldD．may
B

试题分析：考查情态动词。If you must (do sth.)“(表示虽不赞同但可允许)如果你一定要(那么做)”。must“偏偏；非要”，符合句意。句意：如果你非吐痰不可，请吐到专备的痰盂里。故B正确。
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