The two colleges have a reciprocal arrangement whereby students from one college can attend classes at the other.

两所学院有一项互惠协定，允许学生在院际间选课。

《牛津词典》

There are no compulsions on students to attend classes.

没有强求学生上课。

《牛津词典》

You attend classes when you need to.

你可以在你需要时去上课。

youdao

But the school would not let her attend classes with other students because she was African-American.

VOA: special.2009.11.30

Attend all the classes.

不要缺课

耶鲁公开课 - 心理学导论课程节选

Top students in the ninth and tenth grades can attend single-sex classes for math,science,English and social studies.

VOA: special.2010.12.02

At an annual one-week "university" all employees must attend classes from 8 a.m. to 6 p.m.

FORBES: Database evangelist

By Masai standards, Mr Kinyago's is a studious family: only 35% of the children of Kenyan pastoralists attend classes.

ECONOMIST: Why the Masai send their slower children to school

For example, retirees are encouraged to return to campus and attend classes that are being offered to all SAS employees.

FORBES: Why Most Recruitment Strategies Are Failing And What You Can Do To Fix This