4.I had just stepped out of the bathroom and was busily drying myself with a towel____I heard the steps.A.while B.when C.since D.after帮忙做一下、解释、并翻译一下.

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4.I had just stepped out of the bathroom and was busily drying myself with a towel____I heard the steps.A.while B.when C.since D.after帮忙做一下、解释、并翻译一下.
4.I had just stepped out of the bathroom and was busily drying myself with a towel
____I heard the steps.
A.while B.when C.since D.after
帮忙做一下、解释、并翻译一下.

4.I had just stepped out of the bathroom and was busily drying myself with a towel____I heard the steps.A.while B.when C.since D.after帮忙做一下、解释、并翻译一下.
B.意思是:我刚从浴室出来正要忙着用毛巾把身子擦干,就在那时我听到了脚步声.
这是“sb was doing sth when.”句型 .when 的意思是“就在这时”