OG蓝皮书-SC 20----急！

fgh67743185

Declining values for farm equipment and land, the collateral against which farmers borrow to get through the harvest season, is going to force many lenders to tighten or deny credit this spring.

A. the collateral against which farmers borrow to get through the harvest season, is
B. which farmers use as collateral to borrow against to get through the harvest season, is
C. the collateral which is borrowed against by farmers to get through the harvest season, is
D. which farmers use as collateral to borrow against to get through the harvest season, are
E. the collateral against which farmers borrow to get through the harvest season, are


答案是E，我选的是D. 主谓一致可以排除ABC. 但我想知道相比E，D为什么错呢？哪位NN花时间讲解一下，小弟万分感激！！！！！

花子落落

http://forum.chasedream.com/GMAT_SC/thread-35658-1-1.html

请看这里~

fgh67743185

太感谢了！！就是一直找不到OG蓝皮书的讨论。。。。really appreciate!!!!!!~