OG SC第19题是这么解释的: 19.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 正确D OG解释E错误在于but with is awkward and unclear...