题目内容：

i _____（found by accident） their secret ,but i kept the secret for them

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i found by accident their secret ,but i kept the secret for them
我意外地发现了他们的秘密,但我一直为他们的秘密

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根据英语解释完成句子

追答：

i happened to find their secret , but i kept the secret for them 我意外地发现了他们的秘密,但我一直为他们的秘密 用happen to 碰巧