Wampum, beads used as (a form) of exchange (by) some Native Americans, was made of (bits of) seashells, (drill), and strung into belts.
答案是c,可是不知道为什么。而且觉得made,strung两个词使得d看起来更像是有问题,drilled多平行呀。赫赫,说实话,句子看的稀里糊涂,说了笑话,别笑我。
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answer: D drill------drilled
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