You shouldn't knock at the door.簡(jiǎn)單一些的句子有沒I heard a knock at the door. 在黑暗中他撞了一樣?xùn)|西。 I hear someone knock at the door. 我聽見有人敲門了。 Do you hear the knock at the door ?? 幸福常常敲我們的門。 There was a knock at the door . 有人在門上敲了三下。 I was surprised by a knock at the door . 有人敲門使我吃了一驚。 Please knock at the door before entering. 進(jìn)來之前請(qǐng)先敲門。 When I was taking a nap , a student must knock at the door. 正當(dāng)我午睡時(shí)，偏偏一個(gè)學(xué)生在這個(gè)時(shí)候來敲門。 The dog 's ears perked up when hearing a knock at the door . 狗聽見有人在敲門，豎起了耳朵。