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


  1. A.
    to wash
  2. B.
    washed
  3. C.
    washing
  4. D.
    washes
C
解析：
考查固定用法。Stop sb from doing sth阻止某人做某事；
from是介詞，后面使用動名詞的形式。
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C
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