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