I'm glad to find that many trees___in our city last year.A.plant B.planted C.were planted D.are planted为什么不选D 不是I am glad 现在时吗?

I'm glad to find that many trees___in our city last year.A.plant B.planted C.were planted D.are planted为什么不选D 不是I am glad 现在时吗?
I'm glad to find that many trees___in our city last year.
A.plant B.planted C.were planted D.are planted
为什么不选D 不是I am glad 现在时吗?

I'm glad to find that many trees___in our city last year.A.plant B.planted C.were planted D.are planted为什么不选D 不是I am glad 现在时吗?
C
宾语从句要根据时间状语的last year用一般过去时、被动语态