He"s never seen the president before.添加反意疑问句
his mother is a (professor) in a university.对打括号的地方提问
Did the boys throw the volleyball on the playground?变为被动语态
The baby kept on crying until he saw his mother.改写同义句
人气：136 ℃ 时间：2019-08-16 21:20:39
解答
①He's never seen the president before,does he?②What does his mother do in a university?③Did the volleyball on the playground are thrown by the boys?④The baby stopped crying when he saw his mother....
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