gwd25-4

4. GWD25-Q4.

Recent findings lend strong support to the theory that a black hole lies at the center of the Milky Way and of many of the 100 billion other galaxies estimated to exist in the universe.

A.     that a black hole lies at the center of the Milky Way and of

B.     that a black hole lies at the Milky Way’s center and

C.     that there is a black hole lying at the milky Way’s center and

D.     of a black hole lying at the Milky Way’s center and

E.      of a black hole that lies at the center of the Milky Way and of(A)

我选了b，为什么选A