on top of the world hunger,some environmental problems human activities have contribyted to ( ) soonA.needing solvingB.need solvingC.needing to be solved D.need to solve

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ontopoftheworldhunger,someenvironmentalproblemshumanactivitieshavecontribytedto()soonA.needingsolvin

on top of the world hunger,some environmental problems human activities have contribyted to ( ) soonA.needing solvingB.need solvingC.needing to be solved D.need to solve
on top of the world hunger,some environmental problems human activities have contribyted to ( ) soon
A.needing solving
B.need solving
C.needing to be solved D.need to solve

on top of the world hunger,some environmental problems human activities have contribyted to ( ) soonA.needing solvingB.need solvingC.needing to be solved D.need to solve
some environmental problems human activities have contributed to need solving soon 中 主句是some environmental problems need solving
human activities have contributed to 是定语从句
need doing或need to be done 表被动 need to do表示主动