这是一道OG上的题, The Iroquois were primarily planters, but supplementing their cultivation of maize, squash, and beans with fishing and hunting. A)but supplementing b)and had supplemented c)and even though they supplemented d)although they supplemented e)but with supplementing 答案是D,但我选的B,首先我觉得这里用and表并列关系也不错啊,然后就是什么时候才会用到had supplemented 这种past perfect tense. 是要有具体时间吗?