问题标题:
MustIwashdishesaftersupper?No,______.A.mustn'tB.don'thavetoC.don'tD.must
问题描述:

MustIwashdishesaftersupper?No,______.A.mustn'tB.don'thavetoC.don'tD.must

陈雪利回答:
  must有两个否定形式:1.mustn't,表示“不许”,“禁止”   2.needn't=don'tneedto/don'thaveto/haven'tgotto,表示“不必”   所以B
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