问题描述：
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
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
问题解答：
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