Though ______, many laws of nature exist.


  1. A.
    not having been discovered
  2. B.
    having not been discovered
  3. C.
    not having discovered
  4. D.
    having not discovered
A
解析：
連詞加現(xiàn)在分詞短語作狀語；此句等于：Though the laws of nature have not been discovered
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