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  • 更新 2022-09-03
  • 科目 英语
  • 题型 单选题
  • 难度 中等
  • 浏览 2149

— What are the _______ doing there?
— They are busy _______ their science experiment.

A.Boys students; to do B.Boy students; to do
C.Boys students; doing D.Boy students; doing
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相关知识点

—Whatarethedoingthere?—Theyare