I once did it.
the thing(s) you didthe thing(s) you've ever done
应该是 get used to doing sth = 习惯于做某事或者是 used to do sth 过去曾经作过某事 He got used to eating peppers.他习惯吃辣椒了。 He used
i had been done something
I have do sth befor.
这句话用ihavebeentobjusedtodosth是你要的曾经做过某事的意思,但学英语要变通
have done something before .... done something before..
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