---Who were those people with the flags?-A group itself the League of Peace.A. callsB.

问题补充：

---Who were those people with the flags?

---A group itself the League of Peace.

A. calls

B. calling

C. called

D. being called

答案：

A. calls

(答案→)B. calling

C. called

D. being called

解析：考查非谓语动词。句中calling itself the League of Peace.作定语，修饰名词group，与group之间为主动关系，为“自称”之意，故选B。