问题
选择题
The train is running ________ 120 kilometres an hour.[ ]
A. at a speed
B. at the speed
C. at a speed of
D. on a speed of
答案
答案：C
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The train is running ________ 120 kilometres an hour.[ ]
A. at a speed
B. at the speed
C. at a speed of
D. on a speed of
答案：C