After pulling out of the station, the train began to .A.pick upB.speed upC.come
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After pulling out of the station, the train began to ________.
A.pick up
B.speed up
C.come up
D.run up
试题答案
B
题意：驶出车站后，火车开始加速。speed up可表示“加速”。若选A项，应是pick up speed（加快速度）。