---People find it hard to get across the river.---I think at least two bridges _____ over it.A.need B.are needing C.will need D.are needed

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---People find it hard to get across the river.---I think at least two bridges _____ over it.A.need B.are needing C.will need D.are needed
---People find it hard to get across the river.---I think at least two bridges _____ over it.A.need   B.are needing   C.will need   D.are needed

---People find it hard to get across the river.---I think at least two bridges _____ over it.A.need B.are needing C.will need D.are needed
D 这里应该是被动的,need做实意动词“需要”,over 是介词,意为“穿过,跨过”
人们发现很难跨过这条河流.我认为至少需要两座桥才能过去.

选D 被动语态。
bridges 和.need 之间是动宾关系,所以选d.