As the years passed many occasions—birthdays awards graduations—with Dad’s flowers.A. are

问题补充：

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

答案：

A. are marked

(答案→)B. were marked

C. have marked

D. had marked

解析：根据所提供的情景As the years passed可判断出要用一般过去时,表示过去发生的动作或存在的状态。根据many occasions和mark的关系可确定用被动语态,表示被动。一般现在时表示经常性的动作或存在的状态。