She was so lost in her own thought that she was not the ing danger .
A. careful about
B. interested in
C. concerned with
D. aware of
网友回答
A. careful about
B. interested in
C. concerned with
(答案→)D. aware of
解析：短语辨析。Be careful about注意；be interested in对……感兴趣；be concerned with关心，关注；be aware of知道，意识到。句意：她陷入沉思中没有意识到即将到来的危险。所以选D。