________theendofsixmonths,KarlMar

发布时间：2020-07-27 17:32:36

________ the end of six months, Karl Marx ________ Russian well enough to read books in it.A.By; had learnedB.At; had learnedC.In; learnedD.At; learned

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A解析by the end of“至……末时为止”，主句用完成时态，at the end of“在……末尾”，in the end“最后”．
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