【題目】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】句意為:為了提高環(huán)境,每年要植成千上萬的樹。tree是動作plant的承受者;故應用被動語態(tài)。由every year可知此句為一般現(xiàn)在時,故選B。

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