23．Before they reached the house, a new wave came, down trees and brought down some walls. A.——青夏教育精英家教网—

摘要：23．Before they reached the house, a new wave came, down trees and brought down some walls. A. sweeping B. had swept C. swept D. having swept

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用动词的适当形式填空

Before they reached the house, a new wave came, _____(sweep) down trees and brought down some walls.

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