求教！

6.     One of Arthur Jessop’s first acts as president of the FHA was to deny a request from the private sector that federal home loan programs should be expanded to cover houses not conforming to civil construction codes.

(A) should be expanded to cover houses not conforming to

(B) be expanded to cover houses not conforming to

(C) should be expand to cover houses not conforming with

(D) would have been expanded to cover houses not conforming to（B）

                (E) had to be expanded to cover houses not conforming with

为什么此处不能用should？答案B明显是有省略，省略的是would？

谢谢！

CE:conform with排除  D：haave been排除

request n. 虽然字典上说可以用should（eg:your request that I should destroy the letter）

但是request,order 等名词后面的表语从句和同位语从句中,用(should ) 动词原形,表示虚拟,should常常省略

不晓得解释对没有、