请教这道语法题

依然雏田

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.

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

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

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

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

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

hotsauce

B 应该 对吧

依然雏田

能帮我分析一下吗？