twenty trees had been planted by the time we left

twenty trees had been planted by the time we left
为什么要用had been planted 这个时态而不是had planted

小猪tom 1年前已收到1个回答举报

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主语是“twenty trees”,树应该是被种植,所以用被动语态,其结构是：be + 过去分词.由于plant 这个动作在left之前发生,所以用过去完成时的被动语态.

1年前

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