可以用KNOCKING,但是要去掉IS
hear sb do/doing sth
hear a knock也是对的,只是knock在这里是名词,上面是动词,词性变了,都是对的
这题是过去式,由谓语动词的HEARD 可以看出
前面是个时间状语从句,原句是when we were cooking supper.
当从句的主语和主句的主语相同时,可以省去从句中的主语和谓语动词.所以不要WE WERE.
when cooking supper 是什么时态啊?
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