We were about to go out for a walk ______ it began to rain. A．while B．before C．as D．when
2022-12-22 17:27:27 56次 2014届山东省高二上学期期末模拟英语试卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
We were about to go out for a walk ______ it began to
rain.
A．while B．before C．as D．when
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