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题库 / OG2016-SC-24
The Iroquois were primarily planters, but supplementing their cultivation of maize, squash, and beans with fishing and hunting.
but supplementing
and had supplemented
and even though they supplemented
although they supplemented
but with supplementing
还没有题目讲解（毕出老师会陆续发布对官方考题的解读，请保持关注）。
OG的解释，A 粉刺表伴随或解释，都没有表达出转折含义。那么可以理解为BUT做副词和介词时，不具备转折整个句义的功能。
其实这里应该不是转折的意思，是让步的意思，“尽管”
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