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    精英家教网 > 高中英语 > 题目详情
    With some technical problems to be solved, it may be a while _______ the system is put into use.
    A．whenB．afterC．sinceD．before
    D
    考查连词辨析。When当什么的时候，after 什么之后，since自从，before 在什么之前，才，就，句意：有许多技术问题要被解决，可能过一会系统才能被使用。所以选D。
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