求问but的用法

heathrine

OG12版19题
The Iroquois were primarily planters,but supplementing their cultivation of maize,squash,and beans with fishing and hunting.
对答案没有疑问，但是求问大家，but可以这么用吗，就是置于伴随性状态的分词前？OG上本题的解释没有涉及到这点。谢谢大家！！