题目内容

-Can you go swimming with us this afternoon?

-I’d like to, but I ________ take care of my little sister at home because my mother is ill.


  1. A.
    need
  2. B.
    must
  3. C.
    should
  4. D.
    have to
D
此题考查情态动词的用法.need表“需要”.作情态动词常用于疑问句或否定句中.should表“应该”,must或have to表“不得不,必须”.根据句意应用must或have to.又因为must表客观,have to表主观,根据“妈妈病了”,所以选D.
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