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  -- _____is that used for?
---_____ the floor.
A.Why; To cleaningB.What; CleaningC.Why; To cleanD.What; clean
B
句意“这是用来干什么的?”“扫地。”所以第一个空选what。第二空应该做介词for的宾语,所以使用cleaning。答案B。
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