---Did you go to Hawaii for the vacation?---I _______to go, but I got sick at the last minute.A.was planningB.have plannedC.had been planningD.have been planning
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C解析had planned/intended/wished/wanted 等表示原来打算做而后来没有做。had been planning 是过去完成进时, 强调"一直在"计划的意思。