- How long did David work here? - For half a year, he didn't leave much_______on usA.expressionB.instructionC.conclusionD.impression
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D解析试题分析：考查名词辨析。句意：--大卫在这里工作了多久？--四年半，他没有给我们留下太深的印象。leave an impression on sb给某人留下印象。A表情；B指示，说明；C结论；D印象。故选D。考点：考查名词辨析