We haven’t settled the question of __________it is necessary for him to study abroad.
A．ifB．where
C．whetherD．that
C。
根據(jù)句意，空格處應(yīng)填一個表示“是否”的詞，但在A和C兩個表示“是否”的選項中，if不能用于介詞后，故選C。
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