—Is Mr. Black a successful businessman? —Yes, he is a _mind__ and he set up his own company by himself. A. brain B. helpful man C. smart person
I think both A and C can replace "mind". they can both mean "intelligent person"
—Is Mr. Black a successful businessman? —Yes, he is a _mind__ and he set up his own company by himself. A. brain B. helpful man C. smart person
I think both A and C can replace "mind". they can both mean "intelligent person"
Yes you can use it that way. This dictionary describes the use as "informal"
American Heritage Dictionary "brain" 3c
The word "mind" itself wouldn't be used as it is in the test question. One can describe a person as "a great mind", but not as just "a mind". There's no reason other than established usage.