I have been for years troubling the pages of historians, to find out what our fathers have done to the native Americans, but I m

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问题 I have been for years troubling the pages of historians, to find out what our fathers have done to the native Americans, but I must say, that my researches have ______ been to no effect.

选项 A、therefore
B、hitherto
C、however
D、nevertheless

答案B

解析 该句意为:我花了几年的时间来阅读历史学家的书,为的是找到我们的祖先对美国印第安人做了什么事,但是我必须说到目前为止,我的研究还没有什么成效。therefore:因此;hitherto:至今;however:无论如何;nevertheless:仍然,不过。
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