8.
Your Answer is
Correct Answer is G
Explanation
Independent nominative format: SVO, (with) + noun/pronoun + doing/done/to do/prepositional phrase/adj/adv. Being means active, been means passive, and to do means will. According to the sentence meaning "their later clocks reflect Bilys' interest in no history, the most famous example is the American Pioneer History Clock", the active form, ie being, should be chosen.
Item A: This sentence is a complete sentence before the comma and there is no conjunction in the sentence, so a complete sentence cannot appear after the comma, so have been is wrong.