We havent settled the question of it is necessary for him to study abroad.A. ifB. whereC

问题补充：

We haven settled the question of it is necessary for him to study abroad.

A. if

B. where

C. whether

D. that

答案：

A. if

B. where

(答案→)C. whether

D. that

解析：考查名词性从句。在介词后一定是宾语从句；由前面的question可知是不确定的意思，用表示“是否”的whether。

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