关于英语的强调句

Question

where did you lost your key? It was in the hall where we danced.这是一个强调句吗?

Answer 1

不是的.强调句的句型是“It is（was）＋被强调的部分＋that（who）＋原句其它部分”

Answer 2

是的，省略了后面that i lost my key.

Answer 3

不是 是个定语从句。