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Not until they left school ______ how much their teachers loved them and helped them


  1. A.
    they realized
  2. B.
    had they realized
  3. C.
    they would realize
  4. D.
    did they realize
D
本题考查倒装结构。Not until放在句首,主句要发生主谓倒装,再根据时态,“他们意识到”是在“他们离开学校之后”,故用一般过去时。故选D。
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