invites
invited
was invited
were invited
本题考查主谓一致。along with“和/与……一起”适用就远原则,此时主语只看the explorer,它是第三人称单数,又主语和invite之间是被动关系,应用被动语态。结合语境可知事情发生在过去,应用was done,故选C项。句意:探险家和几个同事被邀请到年度庆典上去讲述他们的经历。