Professor Li has ______ interest in history, especially in _____ history of Ming Dynasty.

1. A.
   an; /
2. B.
   an; the
3. C.
   /; the
4. D.
   /; an

Professor Li has      interest in history, especially in       history of Ming Dynasty.

A. an; x 　　　  B. an; the 　　　C. x; the 　　    　D. x; an

 Professor Li has ___ interest in history, especially in ___ history of Ming Dynasty.

A. an; x 　　　       B. an; the 　　        C. x; the 　　　      D. x; an

Professor Li has      interest in history, especially in       history of Ming Dynasty.

Professor Li has ______ interest in history, especially in _____ history of Ming Dynasty.