Question:

There is, however, no proof that if we had ___ been working on space

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“If we had not…” → standard conditional form.
Updated On: Apr 23, 2026
  • not
  • occasionally
  • seldom
  • possibly
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The Correct Option is A

Solution and Explanation

Concept: Conditional sentence structure.

Step 1:
“Had not been working” fits conditional structure.
Conclusion:
Correct word = not
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