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    21、 It is necessary for teachers to               the new ideas and developments in education.

    A．keep up with                                B．come up with         

    C．catch up with                               D．put up with

    21、A

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     It is necessary for teachers to               the new ideas and developments in education.

    A．keep up with                                B．come up with         

    C．catch up with                               D．put up with

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