be used todoing sth.
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be used to doing习惯于做某事 要区别于used to do和be used to do
used to do 过去常常（表示现在不再）
eg: I used to swim in the lake near my village when I was young.
be used to doing习惯于做某事
eg: My grandpa is used to going for a walk after dinner.
be used to do 被用于。。。
eg: Wood can be used to make paper.
