may have a chance to be successful if he tries his best.A Somebody B Everybody C Nobody D

问题补充：

may have a chance to be successful if he tries his best.

A Somebody B Everybody C Nobody D None

答案：

解析：B 考查不定代词。“如果一个人尽自己最大努力的话，每个人都有机会成功。”根据句意可知，答案选B。