We have been good friends __________ we joined the music club.
A. before           B. since             C. until
B
在since 引導(dǎo)的時(shí)間狀語(yǔ)從句中，當(dāng)從句為一般過去時(shí)時(shí)，主句用現(xiàn)在完成時(shí)，故選B
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