题目内容

---Be polite . You _____ talk to the old like that !  ---Sorry , I won’t .
A． needn’tB． wouldn’tC． mustn’tD． couldn’t
C

试题分析：needn’t不必要；wouldn’t不会；mustn’t不应该；couldn’t不能。原句意思是：要有礼貌，你不可以那样对老人说话。对不起，我不会了。根据句意，此处是叫别人不要做某事。答案是C。
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