I once ___ in a junior high school for two years.But I am a

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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 years
A.worked have worked
B.had worked have worked
C.have worked have worked
D.worked work
我想问 once 后面这种应该接什么时态

B
once 是曾经表示过去时所以这句话要用过去完成时
不明白的再问哟,请及时采纳,多谢!
再问：后面那个是have worked我知道 once表示曾经有过干什么的经历我看一般once后面都直接接的是过去式啊所以就纠结了能给我解释一下第一个空吗谢谢~
再答：曾经是过去时曾经之前就学了两年这是过去的过去所以是过去完成时

I once ___ in a junior high school for two years.But I am a i am a student in beijing yucai junior haigh school 高中三年生活英语作文I am a high school student, three years, but the f My name is Susan. I am a junior high school student. I like 英语翻译请翻译I am a 17- year – old high school junior from Arizona i am going to finish high school FOR two years .这句话对吗 Hi, I’m Zhu Hua. I’m a junior high school student in Beijing I am studying in a high school in London. Now I am a high school ( ) in Shanghai i am a student in high school是什么意思 hi,I am a high school student in California. I __ a student two years ago,but I __a teacher now.A.am,am B