this is my sister还是she is my sister

问题描述:

this is my sister还是she is my sister
Hi,David,____my sister,Jane.
A it‘s B this is Che is D she is

看是什么情况.如果是当面向客人介绍你的姐妹,用前者;如果你的姐妹在较远处,用后者.
前面都有打招呼了,这一看就是B.