What's this It's pen .为什么答句不用this is pen,到底it,that ,this 的用法区别是什
问题描述：
What's this It's pen .为什么答句不用this is pen,到底it,that ,this 的用法区别是什
答
先纠正原句的错误,是What's this?It's a pen.用it是一种固定用法,不必考虑其它的