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题文

_______,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
科目 英语   题型 单选题   难度 中等
知识点: 数词的用法
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