【题目】He's a good actor, ____ a lot of comedians are not, and he's a good director and a good writer as well.
A.who
B.what
C.where
D.which

【答案】D
【解析】考查非限制性定语从句。句意：他是一个好演员，可是很多喜剧演员都不是。同时他也是个好导演，好作家。这是一个非限定性定语从句，修饰先行词good actor，其在从句中作表语，故选which，选D。