Most of the professors to our school were from South Africa．A. invitedB. to be invitedC.

问题补充：

Most of the professors to our school were from South Africa．

A. invited

B. to be invited

C. being invited

D. had been invited

答案：

(答案→)A. invited

B. to be invited

C. being invited

D. had been invited

解析：考查非谓语动词的用法。Professors 与invite之间是逻辑上的被动关系,所以用过去分词作定语,表示完成和被动的意义。