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

问题补充：

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

答案：

A. when

B. after

C. since

(答案→)D. before

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。

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