The public transportation in this city is very convenient, where many buses run______．

    A．occasionally         B．approximately    C．immediately    D．frequently

The public transportation in this city is very convenient, where many buses run______．

The public transportation in this city is very convenient, where many buses run______

A．occasionally          B．approximately          C．immediately           D．frequently

The public transportation in this city is very convenient, where many buses run ______.

The public transportation in this city is very convenient，where many buses run         ．

A．recently        B．entirely         C．immediately          D．frequently