有很多联系客户(client)的方式,要么通过电话,要么通过电子邮件,要么直接拜访。
A.
There are many ways of contacting clients, both by phones, and by emails, and by direct visits.
B.
There are many ways of contacting clients, either by phones, or by emails, or by direct visits.
C.
There are many ways of contacting clients, not by phones, not by emails, but by direct visits.