Who is _at the door?She asked,but get no answer

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Who is _at the door?She asked,but get no answer
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Who is _at the door?She asked,but get no answer
Who is _at the door?She asked,but get no answer

Who is _at the door?She asked,but get no answer
Who is knocking_at the door?She asked,but get no answer

knocking敲

that
有不明白的地方再问哟,祝你学习进步,更上一层楼! (*^__^*)

knocking

她问,谁在门外,但没人回答

knocking
是谁在敲门?她问道,但是没有人回答。

who is that at the door?谁在门那里
一般都是用who is that? 那是谁?是谁?

it B 首先,根据句意,C和D不应该选。然后比较A和B,A后面主要是持续性动词,B后既可以用持续性又用非持续性动词。而when还有一个特殊用法,还

it
谁?
但没有回音.

knocking

standing

that ,此处用that 代表门外的那个人,不知道是男士还是女士,所以用that。就像打电话时开始问Who's that.一样。