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

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

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

B

B

A
知识前面有形容词时,前面要加a
a good knowlege of