英语翻译：但是他们没有通知我们就擅自就把原来的东西退掉.
问题描述：
英语翻译：但是他们没有通知我们就擅自就把原来的东西退掉.
答
But they did not notice we put the original stuff drained away without permission.
答
But they returned the original thing before informing me
答
But they returned the things without notifying us.
答
But they have returned the things without telling us.