【题目】Edison made a lot of inventions, ___________of great importance.
A. which I think are B. which I think they are
C. I think they are D. that I think are
在线课程【答案】A
【解析】考查非限制性定语从句。句意：爱迪生有很多发明，我认为很重要．Inventions是先行词，在从句中做主语．逗号隔开，说明非限制性，只能用which引导，I think是插入语．选Ａ．