the email is from my friend ____is studying in a foreign country Awhich Bthat Cwhom Dwhose
问题描述：
the email is from my friend ____is studying in a foreign country Awhich Bthat Cwhom Dwhose
答
Bthat
解析 这个是一个定语从句
my friend 是先行词 后面 要用who 或者that
这里面 my friend 在后面的从句里面做主语.所以不用Cwhom