I have not met her _______ a week.

میں ایک ہفتے سے اس سے _______ نہیں ملا ہوں۔

from

for

none of these

I have not met her for a week.

میں ایک ہفتے سے اس سے نہیں ملا۔

The word "for" is a preposition that is commonly used to express a period that has elapsed.

In this case, it shows how long it has been since the speaker last met the person mentioned.