Question

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

Answer 1

C

本题考查时态。根据句中时间状语By the time he realizes可知用现在完成时。句意：到他意识到走到陷阱为止，对他来说再做什么已经太晚了。