◎ 题干
When Steven suddenly remembered that he had left his mobile in the office, the train was already
________.
[     ]
A. on the go
B. on the rise
C. on the run    
D. on the move
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“When Steven suddenly remembered that he had left his mobile in the office, the train was already________.[ ]A. on the goB. on the riseC. on the run D. on th…”主要考查了你对  【介词和介词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。