Question:

Identify the correct preposition to complete the sentence: He has been working on this data analysis project __________ last Monday.

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Use Since for specific calendar dates, days, years, or times (e.g., since 2021, since 9 AM). Use For when you can count the units of time (e.g., for 5 days, for 3 hours).
Updated On: May 26, 2026
  • for
  • from
  • since
  • by
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The Correct Option is C

Solution and Explanation

Concept: In the Present Perfect Continuous tense structure (has/have been + verb-ing), specific prepositions connect time markers:
  • Since: Used to specify a precise, definite starting point in time.
  • For: Used to indicate a duration or overall length of time.


Step 1:
Determining if the time marker is a point or a duration.
"Last Monday" is a specific day and a definite point on the calendar where the action commenced, rather than a total count of days or hours. Therefore, since is the grammatically correct preposition.
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