________theirseats,thelecturerbegan

发布时间：2020-07-27 16:24:37

________ their seats, the lecturer began his speech.A.TakingB.When takingC.After all the people had takenD.All the people took

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C解析导解：主句中的主语是the lecturer，句意为“所有人落座之后，演讲者开始了演讲”．
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