What's this?后面用it's还是用this is

What's this?后面用it's还是用this is
What's this?后面用it's还是用this is

What's this?后面用it's还是用this is
It's 好一点
但都可以

It's 就可以了，this is 语法没有错误，不过显得累赘重复

this is