很高兴能够在这里回答你的问题,这道题的正确答案应该为：
be used to do 被用于做某事
The pen is used to write a letter.
这个铅笔被用于写信．
be used to doing sth
I am used to getting up early.
我习惯于早起．
be uesd to do/doing区别 不是uesd to do
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