敲
... knock off 下班,停工,很快地写出文章 knock sb up 匆匆做饭,敲门把某人叫醒,使某人疲倦 knock at 敲(门) knock sb up 把某人叫醒 ...
敲门
... knock over 打翻 knock at 敲门／窗等 months. 那个作家在欧洲漫游了好几个月。 ...
门
knock at敲(门、窗等)；laugh at嘲笑；look at看；arrive at到达。根据题意可知B项最佳。
敲击
... right away/now立即，顿时 knock at敲击 on TV在电视里 ...
他敲了敲门便走进去了。
She is pecking away at the keys of a typewriter.她不停地敲打着打字机的键。
knock at my window at eight o'clock and I'll be ready.8点钟敲我的窗，我会准备好的。
There was a light knock at the door.有人在轻轻地敲门。
They heard a knock at the front door.他们听到前门有人敲门。
It'sounds as though there is a knock at the door.听起来好像有人在敲门.
He was scarcely awake when he heard the knock at the door.他刚醒来就听见有人敲门.
There was a treble knock at the door.门上响起了三声敲门声.
There had been a knock at the door and when she opened it she locked herself out.外面有敲门声，她去开门，结果把自己反锁在了外面。
Just as breakfast was completed there was a knock at the door.早饭刚吃完,就有人来敲门.
There was a very quiet knock at the door.有人轻声叩门.
They both heard a knock at the side - door.他们俩都听见有人敲侧门.
Did I hear a knock at the door?是有人敲门 吗 ?
There was a knock at the door. Someone had come looking for me.门外又敲门了, 找我的.
I was preparing for bed when I heard a knock at the door.我正准备睡觉时听到有人敲门.
The global economy has taken a serious knock, at huge human cost.全球经济遭受了严重的打击, 人们为此付出了巨大代价.
She hid the gift immediately she heard the knock at the door.一听见敲门声她就把礼物藏了起来.
