I was exhausted as I _ (write)for over two days please fill up the correct tense - English - Tenses

Question

I was exhausted as I _ (write)for over two days please fill up
the correct tense

Anmol Gupta · Accepted Answer

i was exhausted as i had been writing for over two tays

I was exhausted as I _ (write)for over two days. please fill up the correct tense.