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---You look tired.

---Yes. I ________ without rest until twelve o'clock.


  1. A.
    am working
  2. B.
    was working
  3. C.
    has worked
  4. D.
    had worked
B
本题考查时态。由句中“直到十二点为止”可以判断,这是描述与现在时间无关的过去动作,用过去进行时。
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