.when Marx was already .he began to learn Russian.A.In 1870s, in his fiftiesB.In 1870s, in fiftiesC.In the 1870s, in his fiftiesD.In the 1870s, in fifties 题目和参考答案——青夏教育精英家教网—

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，when Marx was already ，he began to learn Russian.

A.In 1870s； in his fifties

B.In 1870s； in fifties

C.In the 1870s； in his fifties

D.In the 1870s； in fifties

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