Multiple choice

Directions: Fill in the blank by choosing the right preposition from the given alternatives.

It must be an old one (cigarette) smoked ________ our research staff.

  1. to

  2. by

  3. for

  4. of

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

This sentence uses the passive voice, where the action is performed by an agent. The preposition 'by' is the standard choice to introduce the person or group responsible for the action in a passive construction.