He didn’t study hard so he was afraid in the exam.A. failB. to failC. failingD. failed

问题补充：

He didn’t study hard, so he was afraid in the exam.

A. fail

B. to fail

C. failing

D. failed

答案：

A. fail

(答案→)B. to fail

C. failing

D. failed

解析：句意：他学习不努力，所以他害怕考试不及格。Be afraid of sth 害怕某事，be afraid to do sth害怕做某事。根据词组的搭配。故选B。