With some technical problems to be solved, it may be a while _______ the system
题型：不详难度：来源：
With some technical problems to be solved, it may be a while _______ the system is put into use.| A．when | B．after | C．since | D．before |
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答案
| D |
解析
| 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。 |
举一反三
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