【題目】Many trees ________ along the streets every year. So the air is very fresh now.

A. plantB. are planted C. plantedD. were planted

【答案】B

【解析】句意：每年沿著大街都要種很多樹。因此現(xiàn)在空氣很清新。結合語境可知前文描述的是客觀性的動作，故用一般現(xiàn)在時態(tài)。主語是動作對象，故用被動語態(tài)。選B。

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