After a 5-year absence, we returned to our mother school, and not until then       it was such a beautiful school.


  1. A.
    we realized
  2. B.
    had we realized
  3. C.
    we had realized
  4. D.
    did we realize
D
解析：
考查部分倒裝。not until放在句首時(shí)，后面句子要部分倒裝，排除A,C；根據(jù)then，可知要用一般過去時(shí)態(tài)，所以選D。
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