20．Have you heard that house prices are coming down？
 Yes，but I still can't afford        ．（　　）
A．oneB．itC．thatD．this

分析 你聽說了嗎，房價正在下降？
是的，但是我還是買不起（房）．

解答 答案A．考查不定代詞．根據(jù)句意，此空泛指前文提到的"house"，而且是泛指其中的某一個，用one指代同類事物中的某一個，此處相當于a house．it指代前文提到的事物本身．that特指較遠的那一個．this指較近的這一個．

點評 考查不定代詞的題，要在題干中找到所指代的具體事物，確定是泛指還是特指．

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