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

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

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

At 改为 By
【by +过去的时间点】用于过去完成时。

at the end of 应该是by the end of，是截止去年年末，而不是在去年年末

planted 替换 had planted

at应改为by,
at the end of 和by the end of两者of后都可以跟表示时间的名词。可以是过去的时间名词，也可以是将来的时间名词如last year 和next year
前者用于一般时态（一般过去时和一般将来时），后者主句用完成时态（过去完成时和将来完成时），

at the end of ,in the end of , at last 的区别联系 at the end of the last week用于什么时态 at last ,at the end of ,in the end 的辨析.最好有例句哦, at the end of ,atl last,in the end ,finally怎么区分、用法有呢些 Last week I looked at the economy end of the hotel business.这句话中的end 区分in the end,the end of,at last要详细,谢谢 by the end of last ________ of last month we had seen five English films.(ABy the End B At the end of C In the end D to the end -----of last term,students had made lots of new friendsa.by the end b. in the end c.at the end d. to the end ____ the day ,I went back home with my parents A In the end B At the end C At the end of D At last At the end of the Tom had finished his homework at the end of last month.可以是at the end of 它和by the end you 有什么不同? ( ) this semester,he will graduate from junior high school.A.In the end B.Last C.At the end of D.At end of要原因 he finished writing the novel____of last month.A.at the end.B.by the end of 选哪个?为什么? in the end at last 造句 at last与in the end区别 at the end of 问问单项选择：The price of the car increased_____10%_____of last month.选项：A.to;at an end B.to;at the end C.by;at an end D.by;at the end请问选什么?为什么?