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【题目】Every year thousands of trees _________ to improve the environment.
A.were planted
B.are planted
C.have planted
D.will plant

【答案】B
【解析】句意为:为了提高环境,每年要植成千上万的树。tree是动作plant的承受者;故应用被动语态。由every year可知此句为一般现在时,故选B。

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