Multiple choice

Vitamin A maintains the sharpness of human vision ___ and promotes healthy bones.

  1. at night

  2. of the night

  3. for the night

  4. nighttime
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

The phrase 'at night' is the standard idiomatic expression for describing when vision sharpness is maintained. Other options are either unidiomatic or grammatically awkward in this context.

Keep practicing — related questions