---NobodybutJohnandTom________stillinthelabasIpassedbylastnight.---W

发布时间：2020-08-06 11:54:48

---Nobody but John and Tom ________ still in the lab as I passed by last night.---What on ________ earth ________ they?A.were; did; doB.was; did; doC.were; were; doingD.was; were; doing

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D解析主语是Nobody，谓语动词用单数．表示当时正在做什么，用过去进行时．
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