问题
选择题
| The girl had hardly rung the bell _____ the door was opened suddenly, and her friend rushed out to greet her. |
| A. before B. until C. as D. since |
答案
答案：A
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| The girl had hardly rung the bell _____ the door was opened suddenly, and her friend rushed out to greet her. |
| A. before B. until C. as D. since |
答案：A