___________World Expo is regarded as the Olympic Games of the economy, science and technology, ___________expert said.

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

___________World Expo is regarded as the Olympic Games of the economy, science and technology, ___________expert said.  

A. A; an            B. The; an           C. The; a         D. A; the

         World Expo is regarded as the Olympic Games of the economy, science and technology,          expert said.   

A. A; an    B. The; an  C. The; a   D. A; the

         World Expo is regarded as the Olympic Games of the economy, science and technology, _____ expert said．

A．A; an        B．The; an          C．The; a         D．A; the