Most of us are afraid of in front of many people.A. singB. singingC. to singD. sings

问题补充：

Most of us are afraid of in front of many people.

A. sing

B. singing

C. to sing

D. sings

答案：

A. sing

(答案→)B. singing

C. to sing

D. sings

解析：此题考查固定结构be afraid of doing sth表示害怕做某事。