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Before a problem can be solved, it must be obvious ______ the problem itself is.
  


  1. A.
    what
  2. B.
    that
  3. C.
    which
  4. D.
    why
A
本题考察的是名词性从句中主语从句。从句中缺表语,排除B和D;又因题目没有给出problem的范围,故选A;
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Meanwhile, at a nearby church, more than 250 family members and friends gathered, waiting for updates(最新报道)on the rescuers’ progress.

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         B.communication with the trapped miners was cut off

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    D.the rescue started as soon as the accident happened

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         A.In a magazine.              B.In a newspaper.          

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