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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
    句意：有一些技术问题要解决，所以在这个系统投产前还需一段时间。所以选D。
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