问题
选择题
That art center is ____ used to be a factory,_____ millions of cars were made．
A．what; which
B．where; where
C．what; where
D．where; which
答案
答案：C
考查定语从句和名词性从句。What used to be s factory是一个表语从句，what在句子做主语。where millions of cars were made是定语从句，修饰前面的先行词factory, where在句中做地点状语。