The determined mother has devoted all she has to ________ her son out of trouble.
- A.
helping
- B.
help
- C.
have helped
- 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(xiàng)表示已經(jīng)完成了動(dòng)作，不符題意，故選A.
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