While he was investigating ways to improve the telescope, Newton made______ discover which completely changed______man’s understanding of colour.
A．a(chǎn)…不填B．a(chǎn)…theC．不填…theD．the…a
A
第一空指具體一項(xiàng)發(fā)現(xiàn)；man這里表示 “人類”, 前邊要省略冠詞。
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