At the end of last year ,they had planted 3,0000 trees（找错误）_英语解答

At the end of last year ,they had planted 3,0000 trees（找错误）

人气：489 ℃　时间：2019-10-24 01:29:50

解答

【At改成by】 the end of last year ,they had planted 3,0000 trees
用完成时的时间状语