knowledge 泛指"知识"时为不可数名词,不加冠词.
但表示具体某一方面的知识时,则为可数名词,前面加a.
must 在此处作名词(不是情态动词哟),表示"必不可少的事物",因此前面也要加a.
故答案选A.
句意:但是我认为互联网的知识是我们今天工作中必不可少的知识.
bui think_____knowledge of the internet is______must in our
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