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    17．Even after I ______ to soil science，I sometimes wondered whether 1was doing what I wanted to do．（　　）
    A．reactedB．switchedC．adjustedD．contributed

    分析 在我改学了土壤学后，我有时会怀疑我是否在做我想做的事．

    解答 答案：B
    react反应；switch转换；adjust调整；contribute作贡献．句意表达的是换了专业，故选B．

    点评 动词短语是一个比较难的语言点，搭配较多，用法灵活．学习时，要注意积累．尤其是相似或相近的用法，要注意区分和掌握．

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