_,when Marx was already _,he...

_______,when Marx was already _______,he found it was important to study the situation in Russia, so he began to learn Russian.

A. In 1870s, in his fifties

B. In 1870s, in fifties

C. In the 1870s, in fifties

D. In the 1870s, in his fifties

D 【解析】试题分析：句意：句意：在19世纪70年代，当马克思已经五十多岁的时候，他发现研究俄国的形势非常重要，于是开始学习俄语。第一空填in the 1870s是固定词组表示在19世纪70年代；in +形容词性的物主代词+ 数词的复数，表示在某人多大岁的时候。结合语境故选D。考点：考查数词的用法

考点分析：

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_______,when Marx was already _______,he...