This absence is "no questions asked," so that you need present no excuse for missing class.

这次缺席不追究原因，所以你不需要陈述你缺席的理由。

youdao

Let yourself sleep in every once in a while (without missing class, of course), as being rested can make you more productive throughout the day.

每隔一段时间就要休息(当然，不能缺勤)，因为休息可以在一天里做事更有效率。

youdao

According to the NIAAA, about 25 percent of college students report negative academic consequences of their drinking, including missing class, falling behind, doing poorly on exams or papers and receiving lower grades overall.

FORBES: A Sober Assessment of High-Risk Drinking on College Campuses

After a few weeks, I realized my class was missing some of them.

FORBES: Magazine Article

You are right of course, but predictably missing from your list of middle-class tax beneficiaries are car drivers.

ECONOMIST: The 20th century