[求助]OG-11-24 困惑ing

gabriel_djh

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
OG解释中说D中“beginning the phrase with as is incorrect”，我不理解由as开始的短语错是什么意思。是特指这道题，还是普遍真理啊？
还有说E“to protect cannot act as an adjective modifying items”，为啥就不能修饰呢？
这题实在想不通，请各位帮忙。

lengling

animal-hide shields的确不是method

painsper

我记得XDF老师说过animal-hide shields with wooden 本身不是一个METHOD，而是怎么去用这个东西是一个METHOD，所以答案中出现过METHOD的都不能用的

gabriel_djh

谢了。算是有点明白了。

xiao19870205

其实就是

此掩护体是一个重要的军事设备************。**的地方时接下来你可以修饰“军事设备的”

所以，你可以说，

此掩护体是一个重要的军事设备，which cost a lot.

此掩护体是一个重要的军事设备，protecting us from USA.

但是不能说

此掩护体是一个重要的军事设备，to protect us from USA.

gabriel_djh

谢谢。“to do 是不能做非限定定语从句修饰先行词”，能不能麻烦解释得详细点？这个地方不懂……谢谢了

xiao19870205

关于D，你可以参考OG12的解释，比较合理。

Th prepositional phrase “as a protection of
warriors“ is awkward and imprecise; using
the noun form protection creates wordiness
and is awkward in reference to items.

关于E，to do 是不能做非限定定语从句修饰先行词的啊。