【题目】I have some information about the astronauts _______ is helpful to you.
A. who B. what
C. which D. whose
在线课程【答案】C
【解析】
考查定语从句。句意：我有一些关于宇航员的信息，对你很有帮助。本句定语从句的先行词是some information，关系代词which指代先行词，引导定语从句并在句中做主语。关系代词who指人，whose通常做定语，what不能引导定语从句。故C项正确。