It is great pleasure to meet the expert who is doing research on archaeology.A. / ;B. /;

问题补充：

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

A. / ;

B. /; the

C. a; the

D. a; /

答案：

A. / ;

B. /; the

C. a; the

(答案→)D. a; /

解析：考查冠词的用法。句意“见到那个研究考古学的专家是一个很大的荣幸。”pleasure不可数，但指具体的一件事时，看作可数名词；学科前不加冠词。故选D。