题文
Standing at the top of the hill, we saw the train gradually __________ and disappeared in the distance.
| A．swept up | B．picked up |
| C．put up | D．speeded up |
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Standing at the top of the hill, we saw the train gradually __________ and disappeared in the distance.
| A．swept up | B．picked up |
| C．put up | D．speeded up |
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