A teacher was teaching an important lesson on the class

Class 10th English Literature Term 2, Question - A teacher was teaching an important lesson on the class

Guide to Master The Republic Day Speech for School Teachers and Students

English Literature Class 10 Term 2, Answer to the Question – A teacher was teaching an important lesson on the class

Incorrect – on. Correct – in.

The answer to the question: A teacher was teaching an important lesson in the class.