To have come to such a pass; to have fallen to such a state or extent; to have reached such a low point.
他以前学习一直很优秀，没想到现在竟然沉迷游戏，一至于此，真让人感到担忧。
He used to excel in his studies, but now he's completely absorbed in gaming, to such an extent that it's truly worrying.
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