请问一白勇题！

zhangym110

In the most common procedure for harvesting forage crops such as alfalfa,as much as 20percent of the leaf and small-stem material,which is the most nutritious of all the parts of the plant,shattered and fell to the ground.

D the most nutritious parts of the plant,shatters and falls

as much as .......后面怎么是修饰material？怎么用单数谓语动词呢

graceyin7

as much as 應是修飾 20 percent

zhangym110

as much as 應是修飾 20 percent

那为什么主语不是leaf and material呢？

liubin1987

the leaf and small-stem material

是material做主语啊

LOUI1121

修饰MATERIAL