on top of the world hunger,some environmental problems human

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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

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

on top of the world hunger,some environmental problems human on the top of the world mv Sitting On Top Of The World 歌词 on top of the world(同义词) On Top Of The World 歌词 I am on top of the world| sitting on top of the world 翻译 on the top of world歌词 We are on the top of the world I feel like on the top of the world I'm on the top of the world now I am on the top of the world today