单选题 Although Ms. Brown found some of her duties to be ______, her supervision of forty workers was a considerable responsibility.

【正确答案】 C

【答案解析】(menial卑贱的)。句意为：尽管布朗女士发现她的一些任务很低贱，但监督40名工人还是意味着相当大的责任。A．ambiguous模棱两可的；B．provisional临时的；D． unique独特的。