作业帮I happened to meet Mr.Smith at the school gate.同意句转换三种
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I happened to meet Mr.Smith at the school gate.同意句转换三种
I、【met】Mr.Smith at the school gate【by】【chance】
2、【met】Mr.Smith at the school gate【by】【accident】.
3、I 【came】【across】Mr.Smith at the school gate【occasionally】.
无疑后请采纳.
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