填空：这是一封你爷爷给你的电子邮件.This is an e-mail ---------your grandtather -------you.
问题描述：
填空：这是一封你爷爷给你的电子邮件.This is an e-mail ---------your grandtather -------you.
答
This is an e-mail (that) your grandfather (sent) you.
朋友以,爸爸是grandfather,不是grandtather吧