Isawthathewalkedintotheoffice,__

发布时间：2020-07-26 14:42:44

I saw that he walked into the office, ________ down and began to fill in the forms.A.sitB.sittingC.satD.having sat

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C解析根据句子结构看，此处应该是并列谓语，因此选C．
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