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    ________ coincidence, John and I were born on the same day of the same year, and we have a lot in common.

     

    By　

    【解析】考查短语意义。句意：碰巧我和约翰同年同月同日生，而且我们有很多共同点。根据were born on the same day of the same year可知是“碰巧”。

     

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