[求助]大全-116

蓝露

1.        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.

(A) to keep from

(B) to keep it from

(C) to avoid

(D) in order that it would avoid（B）

(E) in order to keep from

这句话如果选择B的话，提取主干不是：a chalice was buried to keep it form....

这样对吗？it需要吗？

不太懂，请NN指教~~