I have been collecting shells for three tear and a half同义句转换I have been collecting shells for _ _ _ _.

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I have been collecting shells for three tear and a half同义句转换I have been collecting shells for _ _ _ _.
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I have been collecting shells for three tear and a half同义句转换I have been collecting shells for _ _ _ _.
I have been collecting shells for three tear and a half同义句转换I have been collecting shells for _ _ _ _.

I have been collecting shells for three tear and a half同义句转换I have been collecting shells for _ _ _ _.
three and a half years

three and half years 三年半已经大于一了，要用复数的years ；其中 的half是名词的“一半”

three and half years
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three and a half years

I have been selling I have been trying I have ever been I too have been I have been to. I have been I have been in. I have been there,have been 是have been in还是have been to的缩写? i have always been there i have never been there I HAVE NEVER BEEN,能否说I never have been I have been so serious I have been so serious I-have-been-at-home I have always been you I have been loving you I have been a person . I have never been away! I have been wet through because i have been died.