Select the most appropriate option to fill in the blank.
Currently, Mittu and Bittu ________ hard to meet the project deadline.

Correct option is B

The correct option to fill in the blank is (b) "are working".
Explanation: The sentence uses “Currently,” indicating an action in progress at the present moment, which aligns with the present continuous tense. “Are working” correctly describes an ongoing action involving Mittu and Bittu.
Example: Currently, they are preparing for their exams.
Why Other Options Are Incorrect:
· (a) worked: Past simple tense, indicating a completed action, does not fit here.
· (c) have worked: Present perfect tense suggests action completed in the recent past but is unsuitable for actions currently happening.
· (d) were working: Past continuous tense, which refers to actions ongoing in the past, is incorrect as it does not indicate current activity.