how many new trees ________(plant)this year by the students of yo_英语解答

how many new trees ________(plant)this year by the students of your school
要说明原因 are planted have been planted 里选一个正确的

人气：259 ℃　时间：2020-03-25 04:08:08

解答

have been planted为什么?今年你们学校的学生已经种了多少棵新树？询问今年完成种新树的情况。