Question

8. My parents have been married for nearly twenty years,and they      (never argue) with each other once.

Answer 1

8. have never argued句意：我父母結婚將近20年了，從沒爭吵過。時間是從結婚到說話時間，所以用現在完成時；后半句的主語they和argue是主動關系，所以用主動語態。