五年级英语语法讲解

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问题描述:

五年级英语语法讲解,在线求解答

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用法:在过去的时间里,两个动作中,发生在前的那个动作要用过去完成时。

结构:had+过去分词

They had sold the car before I asked the price.

The train had left before I arrived at the station.

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