题目内容（请给出正确答案）

[单选题]

______ scientists haw learned a lot about the universe， there is much we still don‘t know

A.A.Once

B.B.Since

C.C.Though

D.D.Unless

提问人：网友zhaodanyy 发布时间：2022-01-06

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· 有6位网友选择 C，占比66.67%
· 有2位网友选择 B，占比22.22%
· 有1位网友选择 A，占比11.11%

ABCD

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