2. 外语
  3. ______much has been known about mammary cancer, the precise way to cure of it still remains largely in the realm of testing.

______much has been known about mammary cancer, the precise way to cure of it still remains largely in the realm of testing.

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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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