2.I racked my brains,but i still couldn't figure out who did that .
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i racked my brains
我绞尽脑汁
以上为机器翻译结果，长、整句建议使用 人工翻译 。
I racked my brains to find the answer.
我为找到此答案而绞尽脑汁。
youdao
I racked my brains about how to break the terrible news to him.
我苦苦思索该怎样把这可怕的消息告诉他。索该怎样把这可怕的消息告诉他。
I've racked my brains, but I have not yet to come up with any solution to the problem.
我已经绞尽脑汁了，但是还没给那个问题找到任何答案。
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