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New houses have been while old ones have been . [ ] A.put on, taken out B.put up

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New houses have been while old ones have been . [ ] A.put on, taken out B.put up

New houses have been ________ while old ones have been ________ .

[]

A.put on, taken out B.put up, pulled down C.put out, pushed in D.put in, piled up

试题答案

答案:B