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变一个句子Theyhavealreadyseenthefilm(变为一般疑问句)()theyseenthefilm()

题目详情
变一个句子
They have already seen the film (变为一般疑问句)
( )they seen the film ( )
▼优质解答
答案和解析
have they seen the film before?
yet 用于否定句