-Whatisbehindthattree?-Theremustbeadog________besideit.A.sitB.satC.tosi

发布时间：2020-08-04 16:10:23

-What is behind that tree?-There must be a dog ________ beside it.A.sitB.satC.to sitD.sitting

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D解析sitting在句中是伴随动作
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