Whether or not the plan will be carried out still ________.
A.remain for us to seeB.is remained to be seenC.remains to be seenD.are remained to see在线课程C
whether等引导的主语从句、v-ing词、不定式等作主语时，谓语动词用单数形式，remain是不及物动词，与不定式被动态连用表示“尚待”。