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

题干

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

上一题下一题 0.64难度单项选择更新时间:2013-11-13 11:05:59

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