I had just stepped out of the bathroom and was busily drying myself with a towel__I heard the stepAwhile Bwhen C since D after

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I had just stepped out of the bathroom and was busily drying myself with a towel__I heard the step
Awhile Bwhen C since D after

B

Bwhen

绝对是B,相信我

A

B when

B.记住,能用when的地方一般可以用while,但是用while的地方不一定能够用when ,这里是在听到脚步声的那一刻,表示时间点,用when