I once _ in a junior high school for two years.But I am a teacher in a senior high school now and I __here for 14 yearsA.worked have workedB.had worked have workedC.have worked have workedD.worked work我想问 once 后面这种应该接什么

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I once ___ in a junior high school for two years.But I am a teacher in a senior high school now and I ____here for 14 yearsA.worked have workedB.had worked have workedC.have worked have workedD.worked work我想问 once 后面 这种应该接什么

I once _ in a junior high school for two years.But I am a teacher in a senior high school now and I __here for 14 yearsA.worked have workedB.had worked have workedC.have worked have workedD.worked work我想问 once 后面这种应该接什么