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What's the machine used _____ It's used to ____ disabled peo

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What's the machine used _____ It's used to ____ disabled people.
What's the machine used _____
It's used to ____ disabled people.
A.to,help B.for,help C.to,helping
What's the machine used _____ It's used to ____ disabled peo
选 :B
be used for
be used to do

再问: 第一个空为什么不用to呢?
再答: to 后面必须跟动词原形 而第一句中used后面 没有动词原形 所以 填 for ,实际上是 for what ,宾语 what 提前