题目内容
1. 他对此事做了彻底的调查，怪不得他了解得那么多。
He had made a thorough investigation. he knew so much about it.
1. No wonder
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题目内容
1. 他对此事做了彻底的调查，怪不得他了解得那么多。
He had made a thorough investigation. he knew so much about it.
1. No wonder