Question:Choose the correct sentence: 

A Unless the world controls its population, mankind will continue to face one problem after another. 
B Unless the world does not control its population, mankind will continue to face one problem after another. 
C Unless the world controls its population, till then mankind will continue to face one problem after another. 
D Unless the world fails to control its population, mankind will continue to face one problem after another. 

+ Answer
C 

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Mohammad Towhidul Islam

Editor, VCampus

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