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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．a(chǎn)bout; on D．a(chǎn)bout; to 

C

解析試題分析：考查介詞：句意：我擔(dān)心因為工作我不能專心工作。Be concerned about關(guān)心，concentrate on 集中精力于……；專心于……選C。
考點：考查介詞

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