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898. Unlike that of human beings, who waste away when they go without food for long periods, hibernating bears exist for months on only their excess fat.
(A) Unlike that of human beings, who waste away when they go
(B) Unlike human beings, who waste away when they go
(C) Unlike human beings, wasting away when going
(D) Dissimilar to human beings, wasting away when（B）
(E) Lacking similarity to human beings, who waste away when
有NN能给讲讲B和C的区别吗－为什么B对而C不对，C中的when going是否是可以接受的省略？以前有人讨论过，但解释不是很明确。谢了！ | 
