The train

The train ___at the present speed until it reach
The train ______ at the present speed until it reaches the foot of the mountain at about nine o’clock tonight.选项:
a、went
b、is going
c、goes
d、 will be going

答案：B
解释：until 引导时间状语从句,主语用一般将来时,从句用一般现在时,即“主将从现”,be + v-ing 可以表示将来,所以正确答案是B.
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