In fact, usually the system blocks anyone trying to sign up for aclass they shouldn't be taking, who hasn't taken the courses you are required to do first as prerequisites.
事实上,这个系统通常会阻止任何想要注册他们不应该选的课程的人,也就是那些没有选必选先修课程的学生。
2
His son, age 15, who had taken an art appreciation class, thought that there was something unusual about the one with a young girl sitting on a garden chair.