This exam is very difficult. Many students are concerned the results.A. aboutB. withC. inD

问题补充：

This exam is very difficult. Many students are concerned the results.

A. about

B. with

C. in

D. of

答案：

(答案→)A. about

B. with

C. in

D. of

解析：考查固定词组。固定词组be concerned about担心…；句意：考试很难，很多学生很担心结果。故A正确。