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上传于：2024-06-12
一、 单项选择。
1、Both his parents look sad . Maybe they ____what's happened to him .
Ａ. knew Ｂ. have known Ｃ. must know Ｄ.will know
2、He has _______ been to Shanghai , has he ?
Ａ. already Ｂ.never Ｃ.ever Ｄ. still
3、Have you met Mr Li ______？
Ａ. just Ｂ. ago Ｃ.before Ｄ. a moment ago
4、The famous writer _____ one new book in the past two year .
Ａ. is writing Ｂ.was writing Ｃ.wr