I heard someone open the door when I passed by 改错

问题描述:

I heard someone open the door when I passed by 改错

1.把open改成opening.
2.翻译:当我路过的时候,我听见有人正在开门.
从句意可知,必须用现在分词做宾语补足语,表示open the door的动作正在进行.