A Given 是對(duì)的.你說得沒錯(cuò),還原成完整句應(yīng)該If it had been given more attention,the tree could have grown better .但不能改為Having been given more attention,非真實(shí)條件句,當(dāng)從句的主語與主句的主語相同時(shí),...現(xiàn)在分詞作狀語中 有having done 的形態(tài)啊 如having done the homewok,I went to play footballhaving done的形式，只用在時(shí)間狀語從句中。如你的這句： having done the homewok,I went to play football【俊狼獵英】團(tuán)隊(duì)為您解答。祝你進(jìn)步。請(qǐng)盡快采納。