Trees on the hills can stop the rains from away the soil.A. to washB. washedC. washingD. w

问题补充：

Trees on the hills can stop the rains from away the soil.

A. to wash

B. washed

C. washing

D. washes

答案：

A. to wash

B. washed

(答案→)C. washing

D. washes

解析：考查固定用法。Stop sb from doing sth阻止某人做某事；from是介词，后面使用动名词的形式。