And although ........ various facets of this topic before, a holistic, wide-angle view of the problem
proved most appropriate for accurate assessment of the problem.

Question

And although ........ various facets of this topic before, a holistic, wide-angle view of the problem
proved most appropriate for accurate  assessment  of the problem.

Accepted Answer

much research has been done into

Answer

much research has been done of

Answer

many researches have been done of

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And although ........ various facets of this topic before, a holistic, wide-ang...

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