we can see pollution everywhere.we should make more efforts ( ) our world.A protecting B to protect C protect D protected

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wecanseepollutioneverywhere.weshouldmakemoreefforts()ourworld.AprotectingBtoprotectCprotectDprotecte

we can see pollution everywhere.we should make more efforts ( ) our world.A protecting B to protect C protect D protected
we can see pollution everywhere.we should make more efforts ( ) our world.
A protecting B to protect C protect D protected

we can see pollution everywhere.we should make more efforts ( ) our world.A protecting B to protect C protect D protected
B to protect