It is ... that ... 强调句的用法

当强调的部分是句子的主语或宾语时，如果主语或宾语是复数名词或多个单数名词（如A,B,and C），前面仍然用“it is”吗？

yes.

eg.It is Tom and Mary who are going to travel around the world.

Thank you!

I get it.