Recent findings lend strong support to thetheory that a black hole lies at the center of the Milky Way and of manyof the 100 billion other galaxies estimated to exist in the universe. A. thata black hole lies at the center of the Milky Way and of B. thata black hole lies at the Milky Way’s center and C. thatthere is a black hole lying at the milky Way’s center and D. ofa black hole lying at the Milky Way’s center and E. ofa black hole that lies at the center of the Milky Way and of
答案是a,为什么后面有个of.
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