If you spit at all. pleasespitin the bucket provided. A. shallB. must C. shouldD. may

发布时间：2020-08-17 08:24:36

If you      spit at all. please spit in the bucket provided.
A. shall
B. must
C. should
D. may

网友回答

A. shall
(答案→)B. must
C. should
D. may
解析：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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