All but one＿＿＿＿take part in the conference＿＿＿＿tomorrow.A.is going to； that is to take placeB.are going to； that is about to take placeC.are going to； that is to be taken placeD.are going to； which is to be held
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D解析all but one 主语是all，且all在此指人，故谓语动词用复数；take place 属不及物动词短语，无被动语态；be about to后面不能跟具体的时间状语。