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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
本題考查時(shí)態(tài)。根據(jù)句中時(shí)間狀語(yǔ)By the time he realizes可知用現(xiàn)在完成時(shí)。句意：到他意識(shí)到走到陷阱為止，對(duì)他來(lái)說(shuō)再做什么已經(jīng)太晚了。
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