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    【题目】Various efforts ________ in the past decades to protect the environment.

    A. had made B. have made

    C. were made D. have been made

    【答案】D

    【解析】考查时态和语态。句意：在过去的几十年里，为保护环境做出了各种努力。根据in the past decades可知句子用现在完成时态，efforts是句子主语，复数形式，和谓语动词make之间是被动关系，所以此处用现在完成时态的被动语态，故答案为D。

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