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    精英家教网 > 高中英语 > 题目详情
    I doubt _______ he will win or not.
    A．whetherB．if C．thatD．when
    A

    试题分析：whether …or not 是不是，whether引导宾语从句。句意：我怀疑是否他会赢。故选A.
    点评：if也可以引导宾语从句，但存在区别，if和whether的区别：1.在动词不定式之前只能用whether 。2.在whether …… or not 的固定搭配中。3.在介词后，只能用whether。4.宾语从句放在句首表示强调时，只能用whether 。5.用if会引起歧义时，只用whether。如用whether可避免歧义
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