3.As the years passed， many occasions―birthdays， awards， graduations with Dad’s flowers.
A. are marked
B. were marked
C. have marked
D. had marked
网友回答
A. are marked
(答案→)B. were marked
C. have marked
D. had marked
解析：分析语境逻辑可知，该空表示“过去被标明”，因此应填一般过去时被动语态动词形式were marked。