After the World War II, the United Nations has been actively carrying out its convention to stop wars and bring peace to nations worldwide. A. Having studied B. Studying C. To study D. Being

After the World War II, the United Nations has been actively carrying out its convention to stop wars and bring peace to nations worldwide.

A. Having studied 
B. Studying   
C. To study 
D. Being studied

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Chọn A

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