i'm to blame
it's my bad
不要搞得太复杂比较好吧 要不然会觉得太啰嗦
actually it is me who should take the responsibility of it.
frankly,i should be responsible for it.
Actually it is my fault.
或者就是 My fault. 不过这个你得加点语气，“其实”的感觉，这样读出来感觉就比上句还好。
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