GRE Text Completion: JiJing 1373-GRE填空机经1373题 - 17BVJQNC1MP7K4V8A

Flash floods are common in desert regions and were widespread before the evolution of trees and woodland soils; in contrast, flash floods are ____________ in woodlands, where floodwaters, impeded by trees, form ponds. A. overshadowed B. redirected C. obscured D. precluded E. mitigated F. abated