题目内容
I took out my notebook and wrote down my teacher’s new phone number I forgot it.
| A．until | B．before |
| C．when | D．since |
B
解析试题分析：在我忘记之前我拿出笔记本记下我老师新的电话号码。A. until直到； B. before在……之前； C. when当……时候； D. since自从，根据句意及语境此题选B。
考点：考查连词的用法
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