While he was investigating ways to improve the telescope, Newton made discover w
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While he was investigating ways to improve the telescope, Newton made ________ discover which completely changed ________ man’s understanding of color．
[]A．a;/
B．a; the
C．/; the
D．the; a
试题答案
答案：A
解析：discover是可数名词，单数可数名词前应用不定冠词a; man’s understanding是不可数名词，前面不用冠词。