No progress was made in the trade talk as neither side would accept the conditions of ________.
A.othersB.the otherC.eitherD.another在线课程B
解析：
句意：由于双方都不愿接受对方的条件，此次贸易谈判未取得任何进展。句中的neither side暗示出有两方。the other，指两方中的另一方，为特指。