The room had a wall through which the scientists could obser

来源：学生作业帮编辑：搜狗做题网作业帮分类：英语作业时间：2024/05/22 11:12:08

The room had a wall through which the scientists could observe what happened without being seen
The room had a wall 后面是否应该加逗号呢?

引导词是through which,这里有介词,不能用that.不是所有的从句都用that 引导.
从句部分改回去是the scientists could observe through the wall.这样是不是能明白了?
再问：明白了，多谢啦

"Galileo built a telescope through which he could study the there was a hole in the wall .Through the hole he could see the clever boy made a hole in the wall ,through which he cou The clever boy made a hole in the wall(through which)he coul They had to climb into the room through the window. He felt hungry and had a through search in the room,but what he built a telescope through which he could study the skies. Could it be in the room we had a talk last night you left could it be in the valley in(which)we had a picnic(that)you I can see him ( )the hole ( )the wall.A,through,inB,through, A dog robot could help () the room. nothing could mitigate the cruelty with which she had treate