We have been good friends we joined the music club. A. before B. since C. until 题目和参考答案——青夏教育精英家教网——

题目内容

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

B

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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