A housing bubble is an economic situation _____ occurs when house prices rise much too fast.
A．whichB．whereC．whatD．why
A

試題分析:考查定語(yǔ)從句。從結(jié)構(gòu)判斷situation為先行詞，后面跟定語(yǔ)從句，從句中缺少主語(yǔ)，所以用關(guān)系代詞which。B，D選項(xiàng)是關(guān)系副詞，在從句中不做主語(yǔ)，C選項(xiàng)what不引導(dǎo)定語(yǔ)從句。句意：房地產(chǎn)泡沫是一種經(jīng)濟(jì)形勢(shì)，這種經(jīng)濟(jì)形勢(shì)只有當(dāng)房?jī)r(jià)上升太快的時(shí)候才會(huì)發(fā)生。所以A選項(xiàng)正確。
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