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34．—Your colleague's spoken English is beautiful, Lily．

       —It's no wonder．She ____ in the USA for a year as a visiting professor．

       A．worked         B．has worked   C．had worked          D．has been working

—Your colleague's spoken English is beautiful, Lily．

       —It's no wonder．She ____ in the USA for a year as a visiting professor．

       A．worked         B．has worked   C．had worked          D．has been working

—Your colleague's spoken English is beautiful, Lily．

       —It's no wonder．She ____ in the USA for a year as a visiting professor．

       A．worked         B．has worked   C．had worked          D．has been working

—Your colleague's spoken English is beautiful, Lily．

—It's no wonder．She ____ in the USA for a year as a visiting professor．

A．worked         B．has worked      C．had worked           D．has been working

34．—Your colleague's spoken English is beautiful, Lily．
—It's no wonder．She ____ in the USA for a year as a visiting professor．