题目选项分析

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

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 have improved over a nine-month period.