Multiple choice softskills communication

Those customers are ____ the most demanding we've ever had.

  1. so far

  2. from far

  3. since far

  4. by far

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

The correct phrase is 'by far' when making a superlative comparison or emphasizing something is the best/worst. This is an idiomatic expression meaning 'by a great margin' or 'clearly'. Options A, B, and C use incorrect prepositions that don't form the standard comparative intensifier phrase.