I had hardly rung the bell ________ the door was opened suddenly, and my son rushed out to greet me....
2022-09-27 20:03:32 172次 天津市部分区2018届高三质量调查(一)英语试卷 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
I had hardly rung the bell ________ the door was opened suddenly, and my son rushed out to greet me.
A. before B. until
C. as D. since
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