If you _______ spit at all. please spit in the bucket provided.

A．shallB．must C．shouldD．may

B

解析試題分析：考查情態(tài)動詞。If you must (do sth.)“(表示雖不贊同但可允許)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，請吐到專備的痰盂里。故B正確。
考點：考查情態(tài)動詞

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