Multiple choice

Directions: Choose the best answer to fill in the gaps. _______ helmets had been revived for soldiers and extended to many workers, safety head coverings for athletes almost inevitably followed.

  1. While

  2. Before

  3. Although

  4. Once

  5. until

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

 'Once' something starts, anothing inevitably follows.

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