The students each their own e-mail address.
A. has
Bhaving
C. have
D. has had
网友回答
A. has
B. having
(答案→)C. have
D. has had
解析：考查主谓一致，本题中的each与句子主语the students是同位语关系，但是句子的主语仍然是the students，是复数形式，故横线上也应该是复数形式。如果本句主语变成：Each of the students…;那么谓语部分就应该使用单数的形式。句意：学生每个人都有自己的电子邮箱。故C正确。