with so many people --- by sending e-mails ,it will become more and more important to have --

题目

with so many people --- by sending e-mails ,it will become more and more important to have --
knowlege of computer.
Acommunicating a good
Bcommunicating good

答案

Acommunicating a good
这里是指,一类/一种,知识.
这种形式,叫做“抽象名词具体化”前面要加a/an,不定冠词.