not ____ that his friend had
Show answer & explanation
Correct answer: A
Explanation
The correct answer is option 1 i.e. knowing.
- "Not" is used as an adverb so we need to use "adjective" after it.
- Past participle and Present participle work as an adjective that can be used here as an adjective.
- Here, Present particle will be used as an adjective as there is conjunction after the filler.
- Hence, the chosen option will be correct.