---WhereisJenny?---Wesawher_________playingthepianojustnow.A.practicedB.p

发布时间:2020-08-04 15:46:45

---Where is Jenny?---We saw her _________ playing the piano just now.A.practicedB.practisingC.practiceD.having practised

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B解析just now(刚才)暗示了空格处用现在分词,表示正在进行的状态。
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