By the time he realizes he into a trap, it’ll be too late for him to do anything about it.
A. walks
B. walked
C. has walked
D. had walked
网友回答
A. walks
B. walked
(答案→)C. has walked
D. had walked
解析：考查时态,等到他意识到他已经步入了一个陷阱,对于他来说做任何有关事情都太晚了.结合语境可知前文描述的是现在已经完成的动作,故用现在完成时态,选C.