Mary quickly closed the door of her room _________ her father could reach it to keep him out. A. bef...
2022-10-17 23:38:06 173次 2015-2016学年天津新华中学高二下学期第三次月考英语卷（解析版） 单项填空 反馈错误 加入收藏 正确率 : 100%
题目内容：
Mary quickly closed the door of her room _________ her father could reach it to keep him out.
A. before B. when C. as D. while
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