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。
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