It should not be a question of humans and nature .A. win; losingB. winning; lostC. win, lo

网友回答

A. win; losing
B. winning; lost
C. win, lost
(答案→)D. winning, losing
解析：
这题考查动名词做宾语的用法：介词of后面接动名词做宾语，humans 和nature分别做动名词的逻辑主语。句意是：这不该是一个人类赢自然输的问题。选D。