---more attention,the tree could have grown have grown bette

A Given 是对的。你说得没错,还原成完整句应该If it had been given more attention,the tree could have grown better 。但不能改为Having been given more attention,非真实条件句,当从句的主语与主句的主语相同时,可以改为非谓语（现在分词或过去分词）的省略形式,但不能用完成时态。 【俊狼猎英】团队为您解答。祝你进步。 再问： 现在分词作状语中 有having done 的形态啊 如 having done the homewok,I went to play football 再答： having done的形式，只用在时间状语从句中。如你的这句： having done the homewok,I went to play football 【俊狼猎英】团队为您解答。祝你进步。请尽快采纳。