It was almost midnight ( ) she heard someone ( ) at the doorA when,knocking B that ,knocked C when ,knock D that ,knocking
问题描述：
It was almost midnight ( ) she heard someone ( ) at the door
A when,knocking B that ,knocked C when ,knock D that ,knocking
答
A
答
A when, knocking
听见某人在做什么，一定是进行时，既然是was就告诉你是过去的时间，就是过去进行时，因此选择A
翻译：当他听见有人敲门时，已经是半夜了.
答
it was ...who/that...属于强调句。It was on Monday night that all this happened.强调时间。判断是不是强调句就把it was ...who/that去掉看原句是否通顺成一句话。但是这道题中去掉it was ...who/that后，因为 midnight前没有介词at,所以语法上不对不能进行翻译，故不属于强调句，有that的选项都可排除。那么也可以判断出缺少时间状语，when引导时状。 hear sb doing sth.故选A
答
A
这是when引导的时间状语从句，hear sb. doing sth.
答
选A when,knocking
hear sb doing sth 是固定搭配