The train at the present speed until it reaches the foot of the mountain at about nine o

问题补充：

The train at the present speed until it reaches the foot of the mountain at about nine o’clock tonight.

A. went

B. is going

C. goes

D. will be going

答案：

A. went

B. is going

C. goes

(答案→)D. will be going

解析：题意为“火车将一直以目前的速度行驶直到今晚9点到达山脚下。”