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She ___ for the professor who was ill.
A.substitutedB.changedC.shiftedD.replaced
A
动词辨析. A. 代替;取代  B. 改变 C. 转移;替换 D.取代;替换。replace 和substitute都可作动词,但用法不一样,一般搭配是replace A with B  用B来代替A;substitute A for B   用A来代替B 。故选A。
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