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「現在完成式」 (Present Perfect) 是什麼？來看解釋、例句！

現在完成式的否定用法是在has 或have 後面加上not ，或者用縮寫「hasn't / haven't」 呈現。 ... They have been engineers since they graduated from college.

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查詢 「have never been用法」的人也找了：

  1. i have never been中文
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