He was asked to his class making a speech at the school opening ceremony.A. representB. s

问题补充：

He was asked to his class making a speech at the school opening ceremony.

A. represent

B. stand for

C. express

D. show

答案：

A. represent

B. stand for

C. express

D. show

解析：考查动词和短语：选项A多用于指实物代表，如代表某人参加会议等；而选项B多用于抽象物体的代表；选项C意为“表达”；选项D意为“表明”等。根据语境，他被要求在开幕式上指代表全班同学做演讲，于是选A。