I doubt _______ he will win or not.
A．whetherB．if C．thatD．when
A

試題分析：whether …or not 是不是，whether引導(dǎo)賓語從句。句意：我懷疑是否他會贏。故選A.
點評：if也可以引導(dǎo)賓語從句，但存在區(qū)別，if和whether的區(qū)別：1.在動詞不定式之前只能用whether 。2.在whether …… or not 的固定搭配中。3.在介詞后，只能用whether。4.賓語從句放在句首表示強調(diào)時，只能用whether 。5.用if會引起歧義時，只用whether。如用whether可避免歧義
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