题文
_________, 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 |
_________, 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 |
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