Question

英语语法问题！！！

But speech has to be triggered, and this depends on interaction between the mother and the child, _____ the mother realizes the cues and signals in the child's crying, smiling,
A when B why C where D which
答案是where 为什么是where啊 ，这是个什么从句

Answer 1

where可以接一个抽象的状况(situation)，举个例子你就懂了

It is a situation where no one can image.

这是一个没人敢想的局面。

Answer 2

主语宾语齐全不用代词，没有reason不用why，没有时间名词不用when，interaction活动，所以用where。

Answer 3

1、should have done意为“过去本应该做某事却未做。”，表达一种责备或内疚的语气。