When Steven suddenly remembered that he
题型：选择题
问题：
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
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