C2087 Slightly Applied Subtotal

Just as he was having a headache, he heard a knock on the door and asked, "Who is it?"

Right after she finished speaking, the door opened and Yang Tao walked in. Long Bing saw that it was Yang Tao, so she asked: "You didn't even answer me, why did you come in just like that?"

"Didn't I knock on the door? But I think that you should have come in without knocking." Yang Tao said