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Excuseme,what'sthisfor?-It'sacleanerandittopickupdirt.A.usesB.isusedC.isusingD.used答案是B、whocantellmethereason?thanksalot、、

题目详情
Excuse me, what's this for? -It's a cleaner and it to pick up dirt.
A. uses B. is used C. is using D. used
答案是B、who can tell me the reason? thanks a lot、、
▼优质解答
答案和解析
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~