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B. was fighting
(when you see "yesterday", you automatically know the verb needs to be past tense fighting is the only verb there that is past tense and makes sense.)
Answer:
The correct answer is 10 hours.
Explanation:
A teacher has the duty to do extra work in order to do a better job. There are two main things that a teacher is urged to do during the 10 hours weekly in non-teaching activities. And they are the planning process of the classes and the other activity is grading students' exams or workshops.
