问题补充：
--Do you know the cost of buying a house in Shanghai is much higher than in Tibet?
---Of course, I know. It’s impossible for me to buy there.
A. that; it
B. one; that
C. that; one
D. it; one
答案：
A. that; it
B. one; that
(答案→)C. that; one
D. it; one
解析：考查代词用法。第一空这里用 that 替代的是 前半句中的主语the cost of buying a house in Shanghai，第二空用one来泛指。
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