With some technical problems to be solved, it may be a while _______ the system is put into use


  1. A.
    when
  2. B.
    after
  3. C.
    since
  4. D.
    before
D
考查連詞辨析。When當(dāng)什么的時候，after 什么之后，since自從，before 在什么之前，才，就，句意：有許多技術(shù)問題要被解決，可能過一會系統(tǒng)才能被使用。所以選D。
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