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    7．When about one of the biggest problems today, many experts say that an energy crisis is approaching and is thus threatening mankind's survival． A．asked B．being asked C．having asked D．asking 【查看更多】

     

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    When       about one of the biggest problems today, many experts say that an energy crisis is approaching and is thus threatening mankind's survival．

           A．asked      B．being asked     C．having asked    D．asking

    查看答案和解析>>

    When       about one of the biggest problems today, many experts say that an energy crisis is approaching and is thus threatening mankind's survival．

    A．asked          B．being asked          C．having asked         D．asking

    查看答案和解析>>


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