The teacher gave the students such a difficult maths problem _________ nobody worked it out．


  1. A.
    as
  2. B.
    which
  3. C.
    that
  4. D.
    so
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科目：高中英語(yǔ) 來(lái)源： 題型：

.The teache rfound ____ difficult to decide____ he would take with him to attend the

conference.

  A.it;whom        B.himself;who       C.this;whom      D.that;who

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