Question

Find out the correct preposition.
She has been working on it _ _ _ _ _ _ last week.

• A. since
• B. on
• C. for
• D. from

Hint:

Use \textit{since} with a specific starting point in time and \textit{for} with a duration (e.g., since Monday, for two weeks).

Answer 1

The Correct Option is A

Concept: The present perfect continuous tense uses \textit{since} and \textit{for} to describe duration. Explanation: \textit{Since} is used with a specific point in time (e.g., last week), while \textit{for} is used with a duration (e.g., for two weeks). Therefore, “She has been working on it since last week” is correct.