I had just fallen asleep when the doorbell rang.
我刚入睡，门铃突然响了起来。
I was about to leave home when the doorbell rang.
我刚要出门，这时门铃响了。
Soon afterwards, the door when the doorbell rang.
又过啦不久，门外忽然门铃响啦。
I was reading the newspaper when the doorbell rang.
我正在看报，突然门铃响了。
I had hardly sat down for a rest when the doorbell rang.
我刚坐下来休息门铃就响了。
He woke up suddenly when he heard the doorbell rang.
当门铃响时他突然醒了。
He woke up suddenly when he heard the doorbell rang.
当门铃响时他突然醒了。
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