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 |
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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．walked |
| C．has walked | D．had walked |
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