It's important to have knowledge of English.改错

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It's important to have knowledge of English.改错
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It's important to have knowledge of English.改错
It's important to have knowledge of English.改错

It's important to have knowledge of English.改错
It's important to have a knowledge of English.
因为KNOWLEDGE一般是可数名词,但在表示某一类特定的知识时为单数

没错啊啊

knowledge前加a

have a knowledge of
固定词组