题目

GMAT语法问题求解

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

by which 中 by怎么理解

为什么用has

正确答案选E

提问时间：2021-03-31

答案

by是通过的意思,这句理解应该为
individual teachers would be given raises or bonuses by a system 教师将被通过一个系统进行评价和发奖金
by which引导的从句是说明system的
因为是mastery of reading skills ,阅读技巧的熟练程度,是不可数的,所以用has