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    【题目】How many trees ____ this year?

    A. are planted B. will plant

    C. have been planted D. planted

    【答案】C

    【解析】考查现在完成时的被动语态。今年已种了多少棵树？表示到现在为止已种了多少树。要用现在完成时。但树是被种，故用现在完成时的被动语态。故选C。

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