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

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

http://zhidao.baidu.com/question/1302423054755113579.html?fr=qlquick

你好，很高兴能够在这里回答你的问题，应该为：
选B
这种药用作什么？
它用于帮助残疾人。
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