Every spring they would plant many trees along the hillside to ________ the soil from being washed away.
A.prevent
B.forbid
C.protect
D.defending
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C解析prevent...(from)..., stop...(from)..., keep... from..., hold...back from doing... discourage...from doing...的意思是“阻止……做……；不让……干……”；forbid doing...的意思是“禁止……”；forbid sb. to do sth.的意思是“禁止某人做某事”；protect...from...的意思是“保护 ……不受……之影响；保护……不遭受……危害”；defend...against/from的意思是“保护、防止、保卫”。