Where is he now?-he is at work now snd he_______until the operation is over.答案为什么是didn't leave 与won't leave有什么区别?

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Where is he now?-he is at work now snd he_______until the operation is over.答案为什么是didn't leave 与won't leave有什么区别?
Where is he now?-he is at work now snd he_______until the operation is over.
答案为什么是didn't leave 与won't leave有什么区别?

Where is he now?-he is at work now snd he_______until the operation is over.答案为什么是didn't leave 与won't leave有什么区别?
主要是时态的问题,仔细读读原句你会发现回答句的前半句是说他现在在哪里,而and后面的句子是补充说明他过去的动作:他知道手术结束才离开的,所以这个句子应该用过去式.won't leave用在将来没有发生的动作.建议多阅读,都推敲.