You have truncated the important part of the sentence -
The reason for the 'ne explétif' is because of avant que.
Here is the Kwiziq lesson explaining how to use it :
Avant que + ne explétif + Le Subjonctif = Before I do
Come back to us if you have further questions on this matter.
Avant que plus the ne explétif is in level C1. This exercise is level B2.
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