中文谷______scientistshavelearnedalotabouttheuniverse,thereis...
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問題詳情：
______ scientists have learned a lot about the universe, there is much we still don't know.
A. Once B. Since C. Though D. Unless
【回答】
C
考點：考查狀語從句
知識點：連詞
題型：選擇題
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