题目内容

How long has China________the WTO?


  1. A.
    joined
  2. B.
    been in
  3. C.
    entered into
  4. D.
    become a member of
B
分析:how long等于for+一段时间,因此只有B项可以,join,enter into,become都是短暂性动作。(延伸)但加入一个组织时可以用enter into.
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