瓦尔塔电瓶生产日期:【the energy of falling water can be used _____ electicity.】

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the energy of falling water can be used _____ (produce)electicity.
be used to do ?还是be used to doing??

the energy of falling water can be used to produce electicity.

be used to do :被用于……

be used to doing是"习惯于......"

to produce

被用于……

不是“过去常常“的意思

前者