求助11th黄皮OG24这道题

yaoshuming

For members of the seventeenth-century Ashantination 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

大全上又没有，又是自己打出来的……

OG解释说这里用as引导短语就是错的，为什么？？？还有我知道a method是作为同位语来就近解释的，那这里它是解释items of military equipment呢？还是解释military equipment，为什么？还有一个问题，正确答案是C，那么protecting是修饰animal-hide shields with wooden frames were essential items of military equipment这句话的吗？如果不是，那它是在修饰谁呢？

问了一堆零碎的问题，希望看到的nn能够帮我看看，谢谢：）

yaoshuming

我觉得也是句子，因为我一直认为doing修饰的应该是它前面的整个句子

yaoshuming

啊……我本来都似乎弄懂了，又被楼上地说糊涂了