题目内容
We have been friends ever________ we were at school together.
| A．before | B．since |
| C．after | D．while |
B
解析试题分析：句意：自从我们一起上学开始，我们就一直是朋友。Ever since:自从...起。根据We have been friends 可知后面为时间状语从句，since引导时间状语从句的句子中，主句用现在完成时态。故选B。
考点：考查时间状语从句的连接词
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