改错：We visited him at his work place between the young trees.

We visited him at his work place 【between--among】the young trees and told him about his work 。" Many thousands of trees must be【plant--planted】every year。" he said , the more 【the】better。This year alone,we've already 【plant--planted】ten thousand【 去掉of 】trees 。 【between--among】两者之间用between; 三者或以上的之间/之中,用among;the young trees肯定不止两个,故用among。 【plant--planted】被动语态,用过去分词。 the more 【the】better。 越多越好;多多益善。 【plant--planted】现在完成时,用过去分词。 【 去掉of 】thousand前有具体数字时,不能再与of 连用