mdcat english MCQ #951

Change into active voice: The vaccine was developed by scientists.

mdcat english MCQ #951

  1. Question 1

    Q1. Change into active voice: The vaccine was developed by scientists.

    • A) Scientists develop the vaccine.
    • B) Scientists developed the vaccine.
    • C) Scientists have developed the vaccine.
    • D) Scientists are developing the vaccine.

    Answer: Scientists developed the vaccine.

    Explanation: Past simple passive with was developed returns to past simple active: scientists developed.