The answer is D.
"Keep", "factor", and "calculate" are all verbs in the list of things the new system allows teachers to do. The other sentences are inconsistent with their list of verbs/adjectives/nouns. Thus, option D is the only one that is grammatically correct.
I am not too good at explaining, so let me know if you are still confused.
Hope this helps! :)
I don’t under stand what u r saying
Answer:
I think the answer is subordinating conjunction
Explanation:
Answer:
The author's point of view about the? Zoos were open to the general public, too, so everyone could find out about animals.
Explanation:
