题目内容
A housing bubble is an economic situation _____ occurs when house prices rise much too fast.
| A．which | B．where | C．what | D．why |
A
解析试题分析:考查定语从句。从结构判断situation为先行词，后面跟定语从句，从句中缺少主语，所以用关系代词which。B，D选项是关系副词，在从句中不做主语，C选项what不引导定语从句。句意：房地产泡沫是一种经济形势，这种经济形势只有当房价上升太快的时候才会发生。所以A选项正确。
考点：考查定语从句。
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