Multiple choice general knowledge math & puzzles

They ……… sixteen days on the moon.

  1. spend

  2. are spending

  3. Spent

  4. none of these

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

The sentence refers to a completed historical event (the moon missions). The simple past 'spent' is the appropriate tense. 'Spend' and 'are spending' imply habitual or current action, which does not fit the context of lunar exploration.