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)立一個不同的社會福利體系這個問題將會出現(xiàn)。這是一個分隔式的同位語從句，根據(jù)語意可知用whether來引導此同位語從句，表示“是否”。if一般不引導同位語從句，故排除D項。 Unless和until只能引導狀語從句，選B。
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