单选题：We see distant galaxies as they were long, long ago because

题目内容：
We see distant galaxies as they were long, long ago because ________ A．they were closer together then
B．the universe has always looked as the same
C．their light takes so long to reach us
D．they have travelled such a long way

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听录音：{MP3:/imgcache/attached/media/20140227/20140227164842_39

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