Astronomers studying the newly discovered star say that it provides clues about our galaxy’s origin, that it may supply data about how fast our galaxy is expanding, and moreover it is perhaps the most distant star in the entire Milky Way. (A) about how fast our galaxy is expanding, and moreover it is perhaps (B) regarding the speed our galaxy expands at; moreover, they think it may be (C) about how fast our galaxy expands and perhaps be (D) on the galaxy’s expansion rate and perhaps (E) about how fast our galaxy is expanding, and that it is perhaps
答案：E 为什么B不可以？另外，我始终搞不太明白“；”对前后的两句句子有什么语法上的要求？请NN指点！ | 
