With so many Western companies, banks, and others setting up offices here, our telephone directory can not _____ and has to be updated every few days.
| A．keep back | B．keep up | C．take back | D．take up |
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With so many Western companies, banks, and others setting up offices here, our telephone directory can not _____ and has to be updated every few days.
| A．keep back | B．keep up | C．take back | D．take up |
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