We have been good friends we joined the music club. A. before B. since C. until

发布时间：2020-08-21 08:12:15

We have been good friends      we joined the music club.
A. before           B. since             C. until

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解析：在since 引导的时间状语从句中，当从句为一般过去时时，主句用现在完成时，故选B
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