While he was investigating ways to improve the telescope, Newton made________discover which completely changed________ man's understanding of colour.

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

While he was investigating ways to improve the telescope. Newton made ________ discover which completely changed ________ man's understanding of colour.

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

While he was investigating ways to improve the telescope, Newton made ______ discover which completely changed ______man’s understanding of colour.

A. a…不填            B. a…the                 C. 不填…the           D. the…a

 While he was investigating ways to improve the telescope, Newton made ______ discover which completely changed ______man’s understanding of colour.

A. a…不填            B. a…the                 C. 不填…the           D. the…a

While he was investigating ways to improve the telescope, Newton made _________ discover which completely changed______ man’s understanding of color.

A．a; 不填

B．a; the

C．不填; the

D．the; a