单选题 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


【正确答案】 D
【答案解析】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。