题目内容
If you _______ spit at all. please spit in the bucket provided.
| A．shall | B．must | C．should | D．may |
B
解析试题分析：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。
考点：考查情态动词
一线名师提优试卷系列答案
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| A．must | B．can | C．need | D．may |
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| A．need | B．must | C．should | D．can |
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| A．shall | B．must |
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| A．can; have to | B．may; can | C．has to; may | D．ought to; must |