Question

Preposition--- He was here.... last week.​

Answer 1

Answer:

he was here since last week..

..........................

Answer 2

Answer:

He was here during last week.

Explanation:

During is a preposition that is used to mean 'all through a period of time'.

Examples:

I met him during my visit to Shimla.

Everyone in the audience remained silent during his performance.  

Many new decisions were taken during the meeting yesterday.  

He fell sick during his stay in Dubai.