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    【题目】No matter when you study, you must ________ the subject on hand.
    A.assist in
    B.bend over
    C.approve of
    D.concentrate on

    【答案】D
    【解析】concentrate on sth.意为“集中注意力做某事，把注意力集中在某事上”。assist in doing sth.意为“帮助做某事”；bend over意为“弯曲，低头”；approve of意为“赞同”。句意：无论何时，只要你在学习，你就必须集中注意力在你手头上的科目上。故选D。

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