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  • English (Railway Apprentice)
  • Directions: Supply suitable preposition to fill in the bl...
Multiple choice

Directions: Supply suitable preposition to fill in the blank.

I am sure the committee has been working ______ this formula.

  1. on

  2. about

  3. at

  4. None of these

Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

I am sure the committee has been working on this formula.

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