【题目】Finally he reached a lonely island _________ was completely cut off from the outside world.
A.when
B.where
C.which
D.whom

【答案】C
【解析】句意：最后他到达一个完全与世隔绝的孤岛。定语从句中缺少主语，因此使用关系代词；先行词island指物，故使用关系代词which.