　　　,mydeskmateandIwerebornonthesamedayandsameyear,sowe...

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　　　, my deskmate and I were born on the same day and same year, so we have a lot in common.

A. By accident B. By chance

C. By coincidence D. By adventure

【解析】选C。句意: 真巧, 我和我的同桌同年同日出生, 所以我们有很多共同之处。by accident=by chance偶然地, 意外地。