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29．Even the top students in our class work out the maths problem , so it be difficult．A．can ' t, must B．can ' t, need C．can, may D．mustn't, can 【查看更多】

 

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Even the top students in our class        work out the maths problem , so it        be difficult．

A．can ' t, must      B．can ' t, need                  C．can, may                D．mustn't, can

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