Maria has written two novels, both of have been made into television series.
A. them
B. that
C. which
D. what
网友回答
A. them
B. that
(答案→)C. which
D. what
解析：考查非限制性定语从句的用法。此处先行词是two novels，后面是一个非限制性定语从句且介词前置，因此用both of which引导。句意：Maria写了两部小说，两部都被拍成了电视剧。