The answer to this is C. or "Have been going"
It's kind of hard to explain this, but basically, if you chose A or B, the sentence would sound wrong, and it's also bad grammar. Try saying it out loud with A or B in it, it might make it easier to see that it's bad grammar :)
Answer:
It is very important for the teacher to carefully select which text or dialogue to use in a class. The level of the students should be considered. Texts or dialogues should neither be too easy or too difficult for the students.
Explanation:
Actually, yes, this is true. Let's look at some examples with the word "all" to see if it agrees with verbs in singular or in plural:
All is lost
All is well
All is arranged already.
All of it is nice
This shows us that "all" agrees with verbs in singular form: the correct answer is a) True.
You could search this up on Google and go to the Quizlet answers! That way it will answer all of the questions you might have of Oedipus! :) I hope this helps out!