【题目】It's great that all the visitors who on the island were saved.
A. trapped B. have been trapped
C. had trapped D. had been trapped
在线课程【答案】D
【解析】
考查时态和被动语态。句意：所有被困在岛上的游客都得救了，这真是太棒了。由were saved可知此事发生在过去，且被困应在被救之前，应用过去完成时；同时，visitors和trap构成被动关系，应使用过去完成时的被动语态。故D选项正确。