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
也不理解为什么不是A
看到but就应该是知道是平行结构,但but 链接了一个分词结构 和一个句子,所以不对
But 应该连接两个独立的句子并且平行,但是这道题后面but连接一个现代分词,现代分词不能做谓语动词,所以but后面不是一个独立的句子。
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