It was twelve o'clock __________they finished the work.


  1. A.
    since
  2. B.
    which
  3. C.
    that
  4. D.
    when
D
考生可能受強調句型的思維定勢影響而選C。若選C,將其還原,則變成:They finished the work twelve o'clock.顯然twelve o'clock前少了介詞at,故錯。因此可判定該題為定語從句,關系副詞when在從句中作狀語,it是指代時間的非人稱代詞,不屬于強調句型中的it。
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