She ___ for the professor who was ill.
A．substitutedB．changedC．shiftedD．replaced
A
動(dòng)詞辨析. A. 代替;取代  B. 改變 C. 轉(zhuǎn)移;替換 D.取代；替換。replace 和substitute都可作動(dòng)詞，但用法不一樣，一般搭配是replace A with B  用B來(lái)代替A；substitute A for B   用A來(lái)代替B 。故選A。
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