21.【2012·山东省菏泽重点高中高三下学期4月模拟】27. Some students often listen to music ______ classes to refresh themselves.
A. between B. among C. over D. during
22【2012·江西省上饶市第一次模拟】32 to gain access to seats at college the seniors are working hard.
A That is;\ B It is;that C What is ,that D Which is;why
