---“Aretheywritingpostcards?”---“No,______.”A.theyareB.theyaren'tC.theyd

发布时间:2020-08-06 20:22:19

---“Are they writing postcards?”---“No, ______.”A.they areB.they aren'tC.they doD.they don't

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B解析A项与No搭配不当,C、D项助动词选择不当,应选B。
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