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    【题目】As students, we must ________ on our studies and work hard instead of fooling around.

    A.investigateB.memoriesC.approachD.concentrate

    【答案】D

    【解析】

    考查动词词义辨析。句意：作为学生，我们必须集中精力于学习和努力学习，而不是游手好闲。A.investigate调查； B.memories记忆； C.approach接近； D.concentrate集中。根据instead of fooling around可知此处表示集中精力于学习和努力学习，固定短语concentrate on集中精力于，全神贯注于，专注于。故选D项。

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