问题描述：
请问这里whether 引导的什么从句
35.We haven’t settled the question of __C____ it is necessary for him to study abroad.（06江苏）
A.if B.where C.whether D.that
35.We haven’t settled the question of __C____ it is necessary for him to study abroad.（06江苏）
A.if B.where C.whether D.that
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