【题目】Houses in China's big cities are so unreasonably expensive that generally young couples can't afford _______ without their parents' financial support.
A.that
B.it
C.any
D.one

【答案】D
【解析】考查代词。句意：在中国的大城市的房子是如此的不合理地昂贵，以至于一般年轻夫妇没有父母的经济支持买不起一套房子。one是house的同位语，而young couples can't afford是定语从句，修饰one的。故选D。