摘要：[2013辽宁]30. We are confident that the environment by our further efforts to reduce pollution. A. had been improved B. will be improved C. is improved D. was improved
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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
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