When a new system _____, the old one is...

When a new system _____, the old one is abolished.

A．came into being

B．comes into being

C．is come into being

D．come into beings

B 【解析】试题解析：考查语法，主句时态是一般现在时，when引导的时间状语从也用一般现在时，come into being 开始实施。故选B。考点：考查时态。

考点分析：

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