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As students, we must ________ on our stu...

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

A.investigate B.memories C.approach D.concentrate

 

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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