We haven't settled the question of it is necessary for him to study abroad.
A. if
B. where
C. whether
D. that
网友回答
A. if
B. where
(答案→)C. whether
D. that
解析：主要测试宾语从句。首先结合所学知识可知能够和介词搭配的连接词没有if，首先排除；另外结合语境可知句子意思为：我们还没有解决对于他是否有必要出国学习的问题。结合语境和答案可知句子 it is necessary for him to study abroad中应该是作出选择的情况。