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. It was the four years from 2004—2007,_______I spent studying for a master’s degree, _____I will never forget.

    A. when; that         B. when; when         C. that ;that          D. which; that

It was the four years from 2004-2007____ I spent studying for a master’s degree, ____ I will never forget．

A．when; that           B．when; when          C．that; that           D．which ; that

．It was the four years from 2004-2007, ____ I spent studying for a master’s degree, ____ I will never forget．

         A．when; that            B．when; when           C．that; that              D．which ; that

．It was the four years from 2004-2007, ____ I spent studying for a master’s degree, ____ I will never forget．

       A．when; that           B．when; when         C．that; that      D．which ; that

．It was the four years from 2004-2007, ____ I spent studying for a master’s degree, ____ I will never forget．