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Knowledge of computer? a computer? computers? the computer?
I'm studying English and want to ask about grammar.
When you want to mention a man who's a computer expert, which sentence would be the best?
A) He has a great knowledge of computer.
B) He has a great knowledge of a computer.
C) He has a great knowledge of computers.
D) He has a great knowledge of the computer.
E) He has a great knowledge of the computers.
I want to know how to say when I want to mention "computer" as a concept, not a real thing.
Thank you in advance.
