As soon as the teacher enters the classroom the students stand up. (Negative)

A No sooner does the teacher enter the classroom than the student stand up.

B No sooner the teacher enters the classroom then the student stand up.

C No sooner had the teacher entered in the classroom than the students stood up.

D The students stood up as the teacher enterd the classroom.

Correct Answer: Option C

- As soon as যুক্ত affirmative sentence-কে negative করার নিয়মঃ No sooner had + sub + v3 + + obj + than + 2য় sub + v2 + বাকি অংশ।