选A
译：科学家告诉我们,我们无法想象宇宙有多么大.
理由：过去告诉的是客观的不变的事实,一律用一般现在时.所以用iS
亲,提示你一下,（遇到客观事实,永恒不变的,一律用一般现在时就行了 ）
The scientist told us we couldn't imagine how large the univ
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请帮我翻译一下,谢拉.有急用Scientist has told us so much about the moon t