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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
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A 的But能不能做介词或副词，supplementing 做伴随状语。。不能选是不是因为主句是主系表结构（一种客观存在），不能跟伴随状语？
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