The police said they would not give up looking into other possibilities ____they find out what happened.


  1. A.
    as
  2. B.
    while
  3. C.
    until
  4. D.
    although
C
考察連詞。該句為not ……until……結構，直到……才……
句意為警察說他們不會放棄調(diào)查其他的可能性，直到他們發(fā)現(xiàn)到底發(fā)生了什么。
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