-- _____is that used for?
---_____ the floor.
A．Why; To cleaningB．What; CleaningC．Why; To cleanD．What; clean
B
句意“這是用來(lái)干什么的？”“掃地�！彼缘谝粋�(gè)空選what。第二空應(yīng)該做介詞for的賓語(yǔ)，所以使用cleaning。答案B。
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