单选题 Chasing wild animals with spears and clubs was a marathon______—and then you had to chop up the catch and drag it miles back to camp.
A. to undertake B. undertaken C. to be undertaking D. undertaking

【正确答案】 D
【答案解析】此处运用隐喻修辞法，将追逐猎物比喻成一项马拉松式的任务，突出的是捕猎的艰苦和耗时。因为它并不仅仅只是像马拉松一样跑步，所以A项错误。B项成分残缺，C项中动词的主被动语态使用错误。所以答案选D，undertaking作名词，表示“事业”，引申为“做的事情”或“承担的任务”。