Question

when tarun reached the auditorium they had _ left ?

Answer 1

When Tarun reached the auditorium, they had already left.

Answer 2

When Tarun reached the auditorium they had already left.

With respect to the corresponding question the most appropriate word to fill-up the blank is “already”.

This is an example of sentence construction, grammar use.

It is important to write error-free sentences.

For additional information on how to write error-free sentences visit relevant resources available online.