Dadwasdoingsomewashing________Mum

发布时间：2020-07-27 13:57:49

Dad was doing some washing ________ Mum was cooking．A.sinceB.afterC.whileD.as soon as

网友回答

C解析因为while表示“当……时”，后面可用进行时，而since, after, as soon as后不用进行时，所以正确
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