Question

Fill in the blank with the most appropriate option.
He ________ at that office for a long time.

• A. works
• B. is working
• C. has been working
• D. working

Answer 1

The correct option is C has been working

Here, 'has been working' in Present Perfect Continuous Tense is correct because it is used to indicate an action that started at some point in the past and may or may not be complete. Here, 'for a long time' suggests an action that started at some point in the past and may or may not be complete.
'Works' in present simple is incorrect because it is used to indicate a future event on a designated date as part of a plan.
'Is working' in present continuous is incorrect because it implies an action going on at the time of speaking.
'Working' is grammatically incorrect.