问题
，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;
B:In 1870s； in fifties
C:In the 1870s； in his fifties
D:In the 1870s； in fifties;
正确答案是：
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