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Was it ________ the conference of APEC that made Shanghai the focus of the world then?


  1. A.
    holding
  2. B.
    to hold
  3. C.
    held
  4. D.
    having held
A
这句话是强调句型,强调句中的主语,原句应是 Holding the conference of APEC made Shanghai the focus of the world then.
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