你不是答案都写错来了?
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根据英语解释完成句子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