I had just stepped out of the bathroom ( )I heard the steps.A while B when C since D after答案是D

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I had just stepped out of the bathroom ( )I heard the steps.A while B when C since D after答案是D

当我听到脚步声之后,我就走出洗浴室!
走出洗浴室,是在听到脚步声之后发生的!
从时态上,这几个单词都可以~!但从语义上,只有用after!