be called away for work

[Tofu]

Hello Alan, Mister Micawber, Beeesneees, Mordant, Esl_Expert and other native English speakers,

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http://tinyurl.com/29mvxyy
Students attending the class are called away for work or personal reasons and do not attend the entire course.
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Is away optional?

[Mordant]

The second part of the predicate makes it optional, but I would still retain it. It gives you a clearer view sooner.

[Tofu]

Thank you, Mordant.