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    22、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

    22、A

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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

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    科目：高中英语 来源： 题型：

    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

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