单选题 13.  The new policy allows employees to turn each day of their ______ vacation time into eight hours of paid leave that can be used at any time.
【正确答案】 B
【答案解析】 选项A错误,accumulate是动词。选项B正确,accumulated是形容词,accumulated vacation time表示职工逐渐积累的休假时间。选项C错误,accumulation是名词。选项D,accumulatively是副词。