Someone called me up in the middle of the night, but he hung up ______ I could answer the phone. A．a...
2022-12-10 08:23:17 150次 2015届辽宁省分校高一下学期阶段性测试英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Someone called me up in the middle of the night, but
he hung up ______ I could answer the phone.
A．as B．since C．until D．before
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