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    精英家教网 > 高中英语 > 题目详情
    The problem will appear____ a different welfare system will be created. 
    A．unlessB．whetherC．untilD．if
    B

    试题分析：考查同位语从句。句意：是否创立一个不同的社会福利体系这个问题将会出现。这是一个分隔式的同位语从句，根据语意可知用whether来引导此同位语从句，表示“是否”。if一般不引导同位语从句，故排除D项。 Unless和until只能引导状语从句，选B。
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