有没有变化格式要求,否则有很多种变化形式,如：
= I met Mr.Smith by chance/accident at the school gate .
= It happened/chance that I met Mr.Smith at the school gate.
= I chanced to meet Mr.Smith at the school gate.
注：第一种变化中,by chance/accident也可以放在句尾；
/ 表示可以任意选用其一.
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