问题
选择题
| Someone called me up in the middle of the night, but they hung up _____ I could answer the phone. |
A. as B. since C. until D. before |
答案
答案：D
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| Someone called me up in the middle of the night, but they hung up _____ I could answer the phone. |
A. as B. since C. until D. before |
答案：D