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

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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

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
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

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
have been planted

How many new trees to plant this year by the students of your school?

填are going to be planted 将要被种植
this year 今年 也就是说还没有发生 需要用将来时
其实是被动语态
所以填将来时+被动语态
如果没有将来时的选项可以选择完成时 have been planted
因为this year同样可以用在完成时中