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I am concerned ____ it that I can’t conc...

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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