He didn't leave until school was over. 对。
因为主句用的是一般过去时，从句也用一般过去时，但是如果主句是一般将来时，从句用一般现在时。
祝你学习进步，更上一层楼！(*^__^*)
有不会的可以再问我:）
He didn't leave until school was over .从句为什么用过去时?
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