Sri Mohan and his friend …… their lesson.
-
has learnt
-
had learnt
-
will learnt
-
is learning
B
Correct answer
Explanation
The subject 'Sri Mohan and his friend' is plural. 'Has learnt' and 'is learning' are singular. 'Will learnt' is grammatically impossible. 'Had learnt' is the only remaining option that fits the past context, though 'have learnt' would be more common in present perfect.