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______much has been known about mammary cancer, the precise way to cure of it st
______much has been known about mammary cancer, the precise way to cure of it st
游客
2025-04-03
20
管理
问题
______much has been known about mammary cancer, the precise way to cure of it still remains largely in the realm of testing.
选项
A、While
B、Since
C、Because
D、When
答案
A
解析
本题考查逻辑关系和连词。“知之甚多”与“仍在测试”构成转折关系,因此选择while,该词置于句首表示“虽然,尽管”。
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