SAT improving sentences题~

题目

SAT improving sentences题~
Many changes occurred when she was the president of the (college,and they increased its educational quality as well as effectiveness.)
为什么要改成college; these changes increased the educational quality and effectiveness of the college

答案

原句代词指代不明（他们提高了它的教学质量和效率）
they用来指many changes（用they不指人的情况很少见了吧）；后面的its指college（如果不仔细读,不知道its指什么,就像中文里面常有的语法错误）
改了以后,句子清楚了许多：
这些改变提高了教学质量和大学的效率.