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
网友回答
A. went
B. is going
C. goes
(答案→)D. will be going
解析：从句用的是一般现在时，故主句要用将来时。将来进行时表示在将来某一时刻或某段时间内正在进行的动作。