Multiple choice general knowledge

You should have waited ____ a half an hour.

  1. from least

  2. by least

  3. at least

  4. until least

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

The correct expression is 'at least' when indicating a minimum amount or duration. 'Waited at least a half an hour' means waited for a minimum of 30 minutes. 'From least,' 'by least,' and 'until least' are not standard English expressions in this context.