sb was doing sth at some的意思

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sb was doing sth at some的意思
xN@_enžҦ۸M.HF

sb was doing sth at some的意思
sb was doing sth at some的意思

sb was doing sth at some的意思
某人在某时做某事(过去进行时)表示在过去的某一时段这人正在做某事.

don't know

什么呀 那是 be good at
不过原题里的“at some”好像也有点问题吧
真没见过