Question

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

Answer 1

C

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。