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

    试题分析：句意：即使在我转想社会科学之后，有时我也会想我是否在做我想做的事。A. reacted反应；B. switched（通常指突然地）改变、转换；C. adjusted适应；D. contributed有贡献于。由句意可知选B。
    考点: 考查动词词义辨析的用法。
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