Prep 2007, Practice 2, 72题，C选项

williamqinc

Several educational research groups are denouncing the mayor's proposal of a system by which individual teachers would be given raises or bonuses should it be that test scores show their students' mastery of reading skills having improved over a nine-month period.

(A) should it be that test scores show their students' mastery of reading skills having

(B) should it be that test scores show their students' mastery of reading skills have

(C) should test scores showing their students' mastery of reading skills has

(D) if test scores showing their students' mastery of reading skills having

(E) if test scores show that their students' mastery of reading skills has

答案是E

语法笔记的解释是：

C. should位于句首引起虚拟语气下的条件状语从句，要是完整的句子，该句的showing应为show

但是，对于C选项，可否这么理解？

test scores作为主语，showing their students' mastery of reading skills作为后置定语修饰test scores，而has improved则是谓语。而且似乎improve test scores也很自然……

shiningsmile

同问啊，C那样理解算对么？求高手指正！！！