It is ______ great pleasure to meet the expert who is doing research on _________ archaeology.

A. / ;           B./; the         C. a; the          D. a; /

It is ______ great pleasure to meet the expert who is doing research on ______ archaeology.

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

It is ______ great pleasure to meet the expert who is doing research on _________ archaeology.

A. / ;           B./; the         C. a; the          D. a; /

It is ______ great pleasure to meet the expert who is doing research on _________ archaeology.