Most of the students ________ to the party were from USA.

A.have been invited

B.to be invited

C.being invited

D.invited

答案及解析： D

解析：

通过分析可知本句的主干是Most of the students were from USA,所以此空不是谓语，是一个定语成分。而people与invite之间为“已经发生的被动行为”。