A textbooks is important but (a)
It is only one among much (b)
Sources that can be use (c)
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Answer: A textbook is important but it is only one among many sources that can be used
Explanation: article A (singular) then followed noun should be singular, after that "sources" is a countable noun then we cnt use"much" it should be many acc. to sources, atlast ""can be used" modals+ v1 but in passive voice (modal+be + v3) shold be followed
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