_____ you are in a speech contest or you are giving a talk in class, a little preparation will make your presentation organized and dynamic.A.EitherB.On condition thatC.No matterD.Whether
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D解析考查连词。whether…or…不管…还是…；either…or…或者…或者… no matter后面应加疑问词，故排除。on condition that只要，条件是，不符合语境。