问题描述：
When he woke up,I opened the door.可不可以这样?
我知道可以 When he woke up,I was opening the door.
When he was waking up,I opened the door.
When he was wasking up,I was opening the door.
不知道两边都是过去式可不可以?
我知道可以 When he woke up,I was opening the door.
When he was waking up,I opened the door.
When he was wasking up,I was opening the door.
不知道两边都是过去式可不可以?
问题解答：
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