SAT语法题一道peter the great totally changed the landscape of St.Petersburg (and it had been) a swamp unused by previous tsars.答案说括号内的有错,错在哪儿?明明后面那句所说的内容就是在change之前为什么不用过去

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SAT语法题一道peter the great totally changed the landscape of St.Petersburg (and it had been) a swamp unused by previous tsars.答案说括号内的有错,错在哪儿?明明后面那句所说的内容就是在change之前为什么不用过去
SAT语法题一道
peter the great totally changed the landscape of St.Petersburg (and it had been) a swamp unused by previous tsars.答案说括号内的有错,错在哪儿?明明后面那句所说的内容就是在change之前为什么不用过去完成时?

SAT语法题一道peter the great totally changed the landscape of St.Petersburg (and it had been) a swamp unused by previous tsars.答案说括号内的有错,错在哪儿?明明后面那句所说的内容就是在change之前为什么不用过去
这里不是过去完成时的问题系,而是属于 it 指代不明的错误.
　　Peter the great totally changed the landscape of St.Petersburg 和 (and it had been) a swamp unusedby previous tsars 是并列句.第一分句中的宾语是 landscape of St.Petersburg,其中landscape 指事物,St.Petersburg 指地点,都可以用代词 it 指代.所以,第二分句的主语 it 属于指代不明.it had been a swamp 既可以理解为 the landscape had been a swamp（这里的地貌曾经是一片沼泽）,也可以理解为 St.Petersburg had been a swamp （圣彼得堡曾经是一片沼泽）.

Peter (the great totally changed the landscape of St. Petersburg ) has been a swamp unused by previous tsars.

改成　St. Petersbur, which had been a swamp unused by previous tsars.
要用定语从句，否则就是句子杂揉

前后主语不一致。
前句主语是Peter the Great，后句主语是it（the landscape of St. Petersburg），即前句的宾语。
这种情况不能简单用连词and连接，而应该采取直接断为两句或者采用定语从句的办法。

两句话没有逻辑关系啊后面的句子就是单纯的是过去发生的事情对现在依然有影响用现在完成时

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