A lot of trees on the hill yesterday.A. are plantedB. will be plantedC. have been planted

问题补充：

A lot of trees on the hill yesterday.

A. are planted

B. will be planted

C. have been planted

D. were planted

答案：

A. are planted

B. will be planted

C. have been planted

(答案→)D. were planted

解析：考查被动语态的时态。选项中各句均为被动语态，因此不必考虑。句中的时间状语为yesterday，用一般过去时态。故选D。