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原句是这样的:(when)Ifastenedmyseatbelt.Theplanetookoff要用when连接句子我觉得应该是whenihadbeenfasteningmyseatbelttheplanehadbeentakingoff.但是不确定对不对,如果不对是怎么样的主要是为什

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原句是这样的:(when) I fastened my seat belt.The plane took off
要用when连接句子
我觉得应该是 when i had been fastening my seat belt the plane had been taking off.
但是不确定对不对,如果不对是怎么样的 主要是为什么
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答案和解析
i had been fastening my seat belt when the plane took off.
这样也可以吧?“当飞机降落的时候我已经系好安全带了”
个人觉得“when”连接的是一个时间点,而不是一个持续的状态