上海師大附中等六校2011屆高三聯(lián)考英語試題

Those concerned by the long-term effects of global warming believe that the damage has been done, ______________________．

　　　A whether we take remedial steps now

　　　 B．if or not we take remedial steps now

　　　 C．whether we take remedial steps now or not

　　　 D．unless we take remedial steps now

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