Julie was good at German, French and Russian, all of ____ she spoke fluently.

　　A who           B whom         C which          D that

. She brought with her three friends, none of ______ I had ever met before.

A. them                B. who                 C. whom              D .these

Mr Black has two sons, one of ________working as a doctor.

A. them          B. who           C. whom            D. whose  

Yang Liwei spent the whole evening talking about the things and persons ________ none of us has ever heard of in CCTV station.

A. which                B. who            C. whom        D. that

Do you know the girl with ________ father I talked for the whole afternoon last Friday?

A. who B. whom     C. whose    D. that