题文
It's surprising that your brother ________Russian so quickly—he hasn't lived there very long.
| A．picked up |
| B．looked up |
| C．put up |
| D．made up |
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It's surprising that your brother ________Russian so quickly—he hasn't lived there very long.
| A．picked up |
| B．looked up |
| C．put up |
| D．made up |
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