单选题
--Your city looks beautiful!--Yes. Lots of trees and grass ______ last year.
A、
[A] were planted
B、
[B] have been planted
C、
[C] planted
【正确答案】
A
【答案解析】
[解析] 本题考查被动语态和时态。“树和草被种植”，所以要用被动语态。last year要求动词用过去时。
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