The determined mother has devoted all she has to ________ her son out of trouble.


  1. A.
    helping
  2. B.
    help
  3. C.
    have helped
  4. D.
    having helped
A
devote后面加to sth或者to doing sth。 to在這里屬于介詞,后面應(yīng)該接名詞或v-ing形式,所以,應(yīng)該是devote oneself to sth/ doing sth。D選項表示已經(jīng)完成了動作,不符題意,故選A.
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