Audrey devoted all her time she had helped/ to helping others 哪个答案准确,为什么?上述有4个选项:A.to help B.helped C.to helping D.in helping

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Audrey devoted all her time she had helped/ to helping others 哪个答案准确,为什么?
上述有4个选项:A.to help B.helped C.to helping D.in helping

选C,首先devote to 是固定搭配,其次to是介词,后面跟动词ing形式