求助。og 128

sangjinghui9

Scientists have recently found evidence that black holes—regions of space in which matter is so concentrated and the pull of gravity so powerful that nothing, not even light, can emerge from them—probably exist at the core of nearly all galaxies and the mass of each black hole is proportional to its host galaxy.
(A) exist at the core of nearly all galaxies and the mass of each black hole is proportional to
(B) exist at the core of nearly all galaxies and that the mass of each black hole is proportional to that of
(C) exist at the core of nearly all galaxies, and that the mass of each black hole is proportional to
(D) exists at the core of nearly all galaxies, and that the mass of each black hole is proportional to that of
(E) exists at the core of nearly all galaxies and the mass of each black hole is proportional to that of

请问its指的是啥？我总觉得指的是the mass。。是evidence么？

sangjinghui9

Forrest_Gu 发表于 2016-4-19 19:12
its指的是black hole吧，看题目意思，前面提到“black holes exist at the core of nearly all galaxies” ...

谢谢。明白了

Forrest_Gu

its指的是black hole吧，看题目意思，前面提到“black holes exist at the core of nearly all galaxies”，后面说的是“每个黑洞都与他的母星系成比例”。