__ the reactions of people with amnesia scientists are learning about the process of memory of the brain.
(A) To study
(B) By studying
(C) They study
(D) They are studying
Correct Answer is: A
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__ the reactions of people with amnesia scientists are learning about the process of memory of the brain.
(A) To study
(B) By studying
(C) They study
(D) They are studying
Correct Answer is: A