It has been known for some time that people with diabetes have a much higher risk of developing Alzheimer's, but not why this is so. Does the sentence in bold means but don't know why?
Top answer
Nearly— '... but we don't know why ', or ''... but nobody knows why '.
— Rover_KE
Nearly— '...
but we don't know why ', or ''...
but nobody knows why '.
Rover
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It has .......been known for some time that people with diabetes have a much higher risk of developing Alzheimer's, but it has not been known .....why................this .........................................................................................is so. (where 'so' ~ 'true')