He began to take political science ________ only when he left school.A.strictlyB.trulyC.carefully	D.seriously
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D解析思路分析：句意为“他毕业之后才开始认真对待政治学”。strictly adv.严格地；take…strictly对……很严格，很严厉；truly adv.诚恳地，真诚地，诚心地；carefully仔细认真地；take sth/sb seriously对……重视，认真对待。故选D。
【点评】本题主要考查副词词义辨析，难度适中。