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    I am concerned ____ it that I can’t concentrate ____ my work because of headache.

    A．of; on B．of; of C．about; on D．about; to 

    C

    解析试题分析：考查介词：句意：我担心因为工作我不能专心工作。Be concerned about关心，concentrate on 集中精力于……；专心于……选C。
    考点：考查介词

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