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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.walks  B.walkedC.has walkedD.had walked
C
By the time这里是连词,引导时间状语从句,根据主句的时态是将来时,推断出从句是一般现在时代替一般将来时。
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