【題目】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

【答案】C

【解析】句意：我擔(dān)心由于頭疼而不能集中精力于我的工作。 be concerned about 擔(dān)心；concentrate on 集中精力于。

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