GRE Text Completion: Fundamental 24 Sets-GRE填空基础24套 - UQM56FY6X57JWOQT!

In frigid regions a layer of permafrost under the soil surface prevents water from sinking deep into the soil, and so the water (i)____________ the land, helping to create bog and (ii)____________ conditions. A. freezes B. tropical C. parches D. swamp E. inundates F. desert