Archaeologists in Ireland believe that a recently discovered chalice, which dates from the eighth century, was probably buried to keep from being stolen by invaders.
to keep from
to keep it from
to avoid
in order that it would avoid
in order to keep from
B选项:"to keep from being stolen" does not indicate what might be stolen, so a pronoun is needed between keep and from.
C选项:to avoid it from being stolen
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