$23. \_\_\_\_\_\_ scientists have learned a lot about the universe, there is much we still don$’t know.
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C
_ _ _ _ _ _ scientists have l…——2015 高考英语第 23 题答案解析
2015_省自主命题（安徽）
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2015_省自主命题（安徽）
$23. \_\_\_\_\_\_ scientists have learned a lot about the universe, there is much we still don$’t know.
C