单项选择题

21（）

A．important
B．impossible
C．impolite
D．interesting

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单项选择题

A. not asking
B. without being asked
C. without asking
D. not asked

单项选择题

A. had reviewed my lessons
B. will review my lessons
C. have reviewed my lessons
D. have done

单项选择题

A. gone where he has
B. why was he questioned by the police
C. where he has gone
D. where has he gone