问题
选择题
We have been good friends __________ we joined the music club.
A. before B. since C. until
答案
答案：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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We have been good friends __________ we joined the music club.
A. before B. since C. until
答案：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
