问题补充：
I can see，there is only one possible way to keep away from the danger.
A. As long as
B. As far as
C. Just as
D. Even if
答案：
A. As long as
(答案→)B. As far as
C. Just as
D. Even if
解析：see在这里并不是用眼睛觉察，而是“领会、明白”的意思。所以，这里as far as I can see=as far as I know“据我所知，依我之见”。
