Astronomers at the Palomar Observatory have discovered a distant supernova explosion, one that they believe is a type previously unknown to science.
更多...
524
15
4712
ChaseDream
(A) that they believe is
(B) that they believe it to be
(C) they believe that it is of
(D) they believe that is
(E) they believe to be of
举报
(E)?
发表回复
手机版|ChaseDream|GMT+8, 2024-11-16 02:29 京公网安备11010202008513号 京ICP证101109号 京ICP备12012021号
ChaseDream 论坛
© 2003-2023 ChaseDream.com. All Rights Reserved.