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I don't doubt __ he will be against the idea

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I don't doubt __ he will be against the idea
A.whether
B.that
why we choose B?
I don't doubt __ he will be against the idea
从意思角度看, doubt后跟if/whether,指不肯定某种情况;但文中都说 i don't doubt 了,表示确定,有点像 i am sure ..., 后接确定的内容.
比较:
I doubt whether he is right(or not).我不肯定他是不是对的.
I don't doubt that he is right. 我肯定他是对的.