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 the1870s; in fifties;
B:In 1870s; in fifties
C:In the 1870s; in his fifties
D:In the1870s; in fifties;
正确答案是：
同类题型
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