_______, 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 |
_______, 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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