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(tài)。Up to now,到現(xiàn)在為止,是現(xiàn)在完成時態(tài)的標志,所以選D。
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