While he was investigating ways to improve the telescope, Newton made ______ discovery 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 ______ discovery 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 _______discovery which completely changed ____ man’s understanding of color.

a ,/     B. a ,the     C. /, the     D. the ,a

While he was investigating ways to improve the telescope, Newton made ______ discovery 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 _______discovery which completely changed ____ man’s understanding of color.

a ,/     B. a ,the     C. /, the     D. the ,a

While he was investigating ways to improve the telescope, Newton made _______ discovery 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 ________ discovery which completely changed ________ man’s understanding of color.

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 ____ discovery which completely changed ________ man’s understanding of color.

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

While he was investigating ways to improve the telescope, Newton made ________ discovery which completely changed ________ man’s understanding of color.

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 ______ discovery which completely changed ______ man's understanding of colour.

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