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

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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。