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the house __yesterday cost him 8000yuan

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the house __yesterday cost him 8000yuan
A,purchased
B.which is purchased
为什么B是错的?
而答案A就是对的.
如果选A的话为什么purchased不需要be动词呢来构成被动呢?
这里选A是因为which was purchased 省略了which was ,也因此B 的时态是不对的.
再问： 那A呢 既然有了主语为什么不加be动词呢？
再答： 此句中的谓语动词是cost ，所以前面的句子中不能再出现谓语，只能用非谓语形式.这里过去分词purchased（购买的）做后置定语，修饰house.
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