[文法] before it going on的文法問題

[elsa1010 (elsa)]

查字典時看到一個例句:

Considering severity of this problem,

the resultful measueres must be adopted before it going on worsening.

想請問最後的"before it going on worsening"的文法

為什麼it之後可以直接加going?

中間省略了is嗎?

謝謝

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