While he was investigating ways to improve the telescope, Newton made ________ discover which completely changed ________ man’s understanding of colour.(2.0分)<br>A: a…不填<br>B: a…the<br>C: 不填…the<br>D: the…a

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题目内容（梦想在线大学英语1）

While he was investigating ways to improve the telescope, Newton made ________ discover which completely changed ________ man’s understanding of colour.(2.0分)
A: a…不填
B: a…the
C: 不填…the
D: the…a

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