it is used to pick up dirt.它被用去除灰尘的
be used to do/for doing 表用途（被用来~）
be used to doing 习惯于
be used as 作为
used to do sth.过去常常
遇见be used to……要看句子的意思~再去判断是to do 还是to doing
希望帮到lz~
Excuse me, what's this for? -It's a cleaner and it to pick u
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