-Our city looks more beautiful!
-Yes. Lots of trees and grass ______ since last year.
A．have been planted B．a(chǎn)re plantedC．will be plantedD．were planted
A
在英文中，有since引導(dǎo)的時(shí)間狀語(yǔ)，句子的主要成分用完成時(shí)態(tài)，表示自從某個(gè)時(shí)候一直做某事，完成時(shí)的結(jié)構(gòu)為have+動(dòng)詞的過(guò)去分詞，故本題選A。
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