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精英家教網 > 高中英語 > 題目詳情

By the time he realizes he ______ into a trap, it'll be too late for him to do anything about it.


  1. A.
    walks
  2. B.
    walked
  3. C.
    has walked
  4. D.
    had walked
C
解析:
本題考查時態。此題中的by the time...意為“到……時間為止”,在句中作時間狀語。又因為realizes為一般現在時,所以可以排除B、D兩項。A項表示“經常性的動作”,也不合題意。故選C。
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