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    We are confident that the environment________by our further efforts to reduce pollution.                                                                (2013·辽宁，30)

    A．had been improved B．will be improved
    C．is improved D．was improved

    B

    解析考查时态。根据we are confident和by our further efforts可知，环境得到改善应该是将来的事情，故用一般将来时的被动语态。

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