I had just stepped out of the bathroom ( )I heard the steps.A while B when C since D after到底是B还是D 网上版本太多,分析.

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Ihadjuststeppedoutofthebathroom()Iheardthesteps.AwhileBwhenCsinceDafter到底是B还是D网上版本太多,分析.Ihadjuststep

I had just stepped out of the bathroom ( )I heard the steps.A while B when C since D after到底是B还是D 网上版本太多,分析.
I had just stepped out of the bathroom ( )I heard the steps.A while B when C since D after
到底是B还是D
网上版本太多,分析.

I had just stepped out of the bathroom ( )I heard the steps.A while B when C since D after到底是B还是D 网上版本太多,分析.
B 当……的时候
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