My uncle arrived while I (cook) the dinner. (১৮তম শিক্ষক নিবন্ধন স্কুল: ২০২৪)
কwould cook
খhad cooked
গcook
ঘwas cooking✓
ব্যাখ্যা
The correct answer is option (d) "was cooking."
When two past actions are described — one ongoing and one interrupting — the ongoing action uses Past Continuous and the interrupting action uses Simple Past.
Structure: While + Subject + Past Continuous, Subject + Simple Past.
'My uncle arrived' (Simple Past) interrupted 'I was cooking' (Past Continuous).
Source: English Grammar in Use — Raymond Murphy.