Choose the corretct variant The wright , brothers had already invented the airplane a) in 1912 b) by 1912 c) after 1912 d) till 1912

Choose the corretct variant The wright , brothers had already invented the airplane a) in 1912 b) by 1912 c) after 1912 d) till 1912
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The wright , brothers had already invented the airplane  b) by 1912 
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