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The determined mother has devoted all she has to ________ her son out of trouble.
A.helpingB.helpC.have helpedD.having helped
A
devote后面加to sth或者to doing sth。 to在这里属于介词,后面应该接名词或v-ing形式,所以,应该是devote oneself to sth/ doing sth。D选项表示已经完成了动作,不符题意,故选A.
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