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一道英语题.讲点原因哦

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一道英语题.讲点原因哦
Tom said that Mr.Smith,who gave them a speech last Wednesday,_____.
A.devoted himself to teach B.was devoted to teach
C.was devoted to teaching D.devoted to teaching
c 主语是Tom , who gave them a speech last Wednesday是插入语,修饰Mr.simth的,所以肯定用被动语态,be devoted to 后面应该跟名词,所以用ing 形式,用动名词