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 |
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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 |