the woman was about to open the door __ she heard a strange sound from inside

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• the woman was about to open the door __ she heard a strange sound from insideA as B while C when D thenjiuzhishigudingdapeima
• the woman was about to open the door __ she heard a strange sound from inside
• 1.she heard front door open and heavy foot steps in the hall可否改为she heard front door opening and heavy foot steps in the hall 2.he told me that he could not go to sleep one night because he heard a strange noise coming from the bar可否改为heard a strange noise come from the bar
• 英语翻译
• 球的体积公式V=4/3πR的三次方.现要把三个半径是3厘米的小钢球铸成一个大钢球,求大钢球的半径（保留两个