句型转换：I happened to meet an old friend of mine in the street.（改为同义句）I happened to meet an old friend of mine in the street.（改为同义句）___ _ ___ I met an old friend of mine in the street.

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句型转换：I happened to meet an old friend of mine in the street.（改为同义句）
I happened to meet an old friend of mine in the street.（改为同义句）
_____ _____ _____ I met an old friend of mine in the street.

It happened that

句型转换：I happened to meet an old friend of mine in the street.（改为同义句）I happened to meet an old friend of mine in the street.（改为同义句）_____ _____ _____ I met an old friend of mine in the street.

句型转换：I happened to meet an old friend of mine in the street.（改为同义句）I happened to meet an old friend of mine in the street.（改为同义句）___ _ ___ I met an old friend of mine in the street.