Mostseniorhighschoolstudentsareworkingharddayandnighttopassthecollegeentranceexamination,gaining______toauniversity.
A.applicationB.admissionC.connectionD.agreement在线课程B
解析：
名词辨析。gain admission to a university：被大学录取。admission：录取；
application：申请、应用；
connection：联系；
agreement：同意、一致意见。