---Whatarethe_______doingthere?---Theyare

发布时间:2020-08-05 14:05:26

---What are the _______ doing there?---They are busy _______ their science experiment.A.Boys students; to doB.Boy students; to doC.Boys students; doingD.Boy students; doing

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D解析考查名词复数和非谓语动词的用法。男学生的复数表示为boy students,固定结构“be busy doing sth”忙于做某事。
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