The problem will appear____ a different welfare system will be created. 
A．unlessB．whetherC．untilD．if
B

試題分析：考查同位語從句。句意：是否創(chuàng)立一個(gè)不同的社會(huì)福利體系這個(gè)問題將會(huì)出現(xiàn)。這是一個(gè)分隔式的同位語從句，根據(jù)語意可知用whether來引導(dǎo)此同位語從句，表示“是否”。if一般不引導(dǎo)同位語從句，故排除D項(xiàng)。 Unless和until只能引導(dǎo)狀語從句，選B。
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