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精英家教網 > 高中英語 > 題目詳情

Up to now, they _________ a good way to solve that problem.


  1. A.
    didn’t find
  2. B.
    can’t find
  3. C.
    hadn’t found
  4. D.
    haven’t found
D
解析:
考查時態。Up to now,到現在為止,是現在完成時態的標志,所以選D。
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