Although it is conceivable that certain electronic services implanted in the brain may someday correct blindness caused by nerve damage, there is now no evidence of their ability to do it.
(A) of their ability to do it
(B) of their doing that
(C) that they can do so
(D) that they might one day be able to do it
(E) to do so
Please give your answers in the comment box below. Solution will be posted tomorrow (Dec-30th) with an explanation for the answer.
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