Li Lei can’t go hiking with us today, because he ________ take care of his sick mother．


  1. A.
    has to
  2. B.
    may
  3. C.
    mustn’t
  4. D.
    needn’t
A
句意為“李雷今天不能與我們一起去遠(yuǎn)足了，因?yàn)樗谜疹櫵〉哪赣H”．B項(xiàng)may意為“可能”；C項(xiàng)mustn’t表示“不允許、禁止”；D項(xiàng)needn’t表示“不必”．has to表示“必須”，而且強(qiáng)調(diào)是由于客觀原因造成的．
情態(tài)動(dòng)詞在語氣上有區(qū)別，法則、規(guī)定等強(qiáng)制性的行為常用must．情態(tài)表示動(dòng)詞的可能性有弱到強(qiáng)的順序依次為：may＜can＜must．
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