-- What’s your plan for this winter vacation?
-- I’ll take an express train to Dalian for my holiday ______ school ends．A.whileB.untilC.immediatelyD.unless
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C解析词义辨析。While当……时候，后跟进行时态；until直到……为止；immediately 一……就；unless除非……否则。句意：你寒假有什么计划？学校一放假我就坐直达大连的火车去度假。所以选C。