how many trees

How many trees ________ this year?
A.are planted
B.will plant
C.have been planted
D.planted

第1个回答  2019-03-18
答案C
由句意可知此句是被动语态,故排除B、D,由时间状语this year说明用现在完成时的被动语态,故再排除掉A,所以选C.