I ________ my key to my office at home, so I had to wait until other teachers ________ to open the door.


  1. A.
    had left; came
  2. B.
    left; came
  3. C.
    has left; came
  4. D.
    left; would come
A
本題考查過去完成時和一般過去時的比較。leave my key這個動作明顯發(fā)生在had to wait之前,所以為過去的過去,用過去完成時;而come這個動作是出現(xiàn)在until引起的時間狀語從句中,應(yīng)該用一般過去時代替過去將來時,所以答案為A項。
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