B,that
由doubt 引导的宾语从句时,doubt 是肯定形式的话,连词用whether,例如：I doubt ( whether ) this exhibition is worth visiting or not.
如果doubt 是否定形式的话,连词用that.本句就是否定形式,表示我觉得不怀疑,那么连词就得是B,that
I never doubt ( ) this exhibition is worth visiting or not.A
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