I didn’t make great progress in my English study _________ my teacher had given me some advice on how to learn the language well．A.unlessB.beforeC.untilD.when
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C解析本题考查连词区别，when都不能与否定词连用，先排除；虽然unless和until都能与否定词连用，但unless常与将来时态连用，而until常与过去时或者将来完成时连用。