【the energy of falling water can be used _____ electicity.】

问题描述:

【the energy of falling water can be used _____ electicity.】
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."