----200 bones forming the framework or skeleton,of the human body

问题描述:

----200 bones forming the framework or skeleton,of the human body
A being over B There are over C What over D Over
为什么 选B 不选 D

如果forming改为form,那么可以选D.这样句子主谓齐全.
但是,这里是forming,选d就没有谓语了哦.