OG12 30

lxsabrina

OG12 SC30
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

答案C没有问题，但是E为什么错呢？to do 结构在这里不能表示目的吗？

jamesch

逗号多余

liujian12

就算去掉了逗号，to do紧接essential items of military equipment，逻辑上还是没有protecting好，现在分词protecting是说明固有的、一直存在的功能，而to do是说明“具体某次”的功能。