OG10语法268题及GWD22语法总结四十
39. 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. a method to protect
B. as a method protecting
C. protecting
D. as a protection of
E. to protect
1.润色：(一级拂拭A,B,D, E )
句末的分词逻辑主语思量;不定式不能零丁在句末做润色身分、
the participle protecting begins a phrase that explains what the shields did
句末分词短语的逻辑主语优先思量句子的主语(末了一句显然是要润色盾牌的，除了c之外，其他的都润色不到这儿)。
2.单双数
Choices A and B awkwardly use the singular word method to refer to items of military equipment rather than to the use of such items. (单双数题目)
3.词用法
a method of准确，，， a method to / a method doing不准确
a method of protecting would be more idiomatic than a method to protect in A or a method protecting in B
4.同位语：同位语要思量能否逻辑意思内涵同等
a protection in D has no noun for which it can logically substitute.
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