"I've been researching Alzheimer’s disease for decades," the doctor said, but I still have so many unanswered questions."

a. been researching
b. Alzheimer’s
c. said, but
d. No error

Respuesta :

It’s D.No error I don’t know why I need 20 words just to send a message but here u go it’s D

Answer:C

Explanation:

Needs quotations

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