A lot of trees in our school last year.A. plantB. plantedC. are plantedD. were planted

问题补充：

A lot of trees in our school last year.

A. plant

B. planted

C. are planted

D. were planted

答案：

A. plant

B. planted

C. are planted

(答案→)D. were planted

解析：考查时态和语态。根据last year，以及trees与plant 之间的关系，故用一般过去时的被动语态。