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    精英家教网 > 初中英语 > 题目详情
    The earth will become worse and worse ________ we do something to stop her from being polluted.
    A．ifB．even ifC．whenD．unless
    D              
                 
    试题分析：考查连词辨析。 If 如果；ever if 即使；when 当。。时候；unless除非。句意：除非我们做一些事情来阻止它被污染否则地球会变得越来越糟糕。Unless 相当于 if not ,根据题意可知，这是个条件句，所以选D项。          
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