◎ 题干
Before they reached the house, a new wave came, _______ down trees and brought down some walls.

A. sweeping
B. swept
C. had swept
D. having swept
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Before they reached the house, a new wave came, _______ down trees and brought down some walls. [ ]A. sweeping B. swept C. had swept D. having swept …”主要考查了你对  【实义动词的过去式】【一般过去时】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。