Smith was much kinder to his youngest child than he was to the others, of course, _____ made the others jealous.

A. what

B. that

C. which

D. who

[答案]C

【精析】本句的意思是：史密斯对更小的孩子更为关爱，当然引起其他孩子的嫉妒。定语从句句法结构题：非限制性定语从句要由关系代词which，who，whose，where，when来引导，此句指事情，因此用which引导非限制性定语从句。