问题
选择题
| I'm sorry you've been waiting so long, but it'll still be some time ____ Tim gets back. |
| A. until B. before C. after D. since |
答案
答案：B
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| I'm sorry you've been waiting so long, but it'll still be some time ____ Tim gets back. |
| A. until B. before C. after D. since |
答案：B