Not until you try to build a machine that does the same task as people do ________．


  1. A.
    you realize how is it incredibly hard
  2. B.
    do you realize how incredibly hard it is
  3. C.
    you realize how incredibly hard is it
  4. D.
    do you realize how it is incredibly hard
B
not…until…“直到……才……”。not until如果放在句首，句子結構要倒裝。在賓語從句中how修飾incredibly hard，故答案選B項。
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