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By the time he realizes he       into a trap, it’ll be too late for him to do anything about it.
A.walksB.walkedC.has walkedD.had walked
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。
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