题目信息
The first eight moons of Saturn were discovered with direct telescopic observation, but long-exposure photographic techniques in the early twentieth century led to the discovery of six more moons, so it nearly doubled the number of moons Saturn has.
A:so it nearly doubled the number of moons Saturn has
B:and it nearly doubled the amount of moons Saturn known to has
C:nearly doubling the number of moons Saturn has
D:nearly doubling the amount of moons Saturn has
E:nearly doubling the number of moons Saturn was known to have
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E:nearly doubling the number of moons Saturn was known to have
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