Question

A housing bubble is an economic situation _____ occurs when house prices rise much too fast

1. A.
   which
2. B.
   where
3. C.
   what
4. D.
   why

Answer 1

A
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。