Astheyearspassed，manyoccasionsbirt

As the years passed， many occasionsbirthdays， awards， graduations ____ with Dad’s flowersA.are markedB.were markedC.have markedD.had marked

参考答案：
B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。