【题目】Maria has written several novels, two of ________ have been made into television series.
A. that B. whom
C. which D. them
在线课程【答案】C
【解析】考查定语从句。本题中定语从句的先行词是several novels，在定语从句中关系代词which指代先行词在句中作of的宾语。句意：Maria写了几部小说，两本小说都已经被制作成了电视连续剧。that不能在句中作介词的宾语，不能引导非限制性定语从句。B项指人不用于指代物。D项不能引导定语从句，如果要用them，这一句必须要加个连词。故C正确。