问题补充:
Trees every year to make our city greener.
A. plant
B. are planted
C. were planted
D. will be planted
答案:
A. plant
(答案→)B. are planted
C. were planted
D. will be planted
解析:被动语态的用法。根据句意“每年种很多树来使我们的城市更绿”,可知用被动语态,时间状语为every year,因此用一般现在时。故选B。
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