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Fred is absent from the meeting. I don't know exactly when he is coming back but I'm sure he'll be back ________ Monday.


  1. A.
    on
  2. B.
    by
  3. C.
    until
  4. D.
    after
B
介詞by后接表時間的名詞，意為“在……之前”如：I have to go back by ten o'clock.我必須在10點鐘以前回去。Will you please finish the work by Friday? 請你在星期五之前完成這份工作好嗎？
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