My friend Bob just bought an apartment in a suburb of Beijing last week.which is
来源：网络
时间：
推荐文章
My friend Bob just bought an apartment in a suburb of Beijing last week，which is much smaller than ours but is three times________expensive.
A．very B．so
C．too D．as
试题答案
D
考查倍数的表达和省略。根据句子所要表达的含义，but后补充完整为：but is three times as expensive as ours/our apartment。