问题
选择题
| —Have you known each other for a long time? —Not very, ______ we started to study in this middle school. |
| A. when B. since C. after D. before |
答案
答案：B
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| —Have you known each other for a long time? —Not very, ______ we started to study in this middle school. |
| A. when B. since C. after D. before |
答案：B