问题
选择题
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
答案
答案：D
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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
答案：D