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单选题
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.
A

therefore

B

hitherto

C

however

D

nevertheless


参考答案

参考解析
解析:
句意: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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