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_______,when Marx was already _______,he found it was important to study the situation in Russia, so...
题目内容：
_______,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
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