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题库 / OG12-SC-30
For members of the seventeenth-century Ashanti nation in Africa, animal-hide shields with wooden frames were essential items of military equipment, a method to protect warriors against enemy arrows and spears.
a method to protect
as a method protecting
protecting
as a protection of
to protect
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其他的名词可选也就只有 A的 a method，但这个equipment 肯定不是一个method，排出法吧
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