98－10－13

13.The fact that _____ was discovered in 1923 by the astronomer Edwin Hubble.

(A) the expansion of the universe

(B) the universe is expanding

(C) the universe, which is expanding

(D) when the universe expands

选A为什么错泥？作“the fact”的同位语啊，难道有that在就一定要用句子了？

选B,fact“事实”，要用陈述句