英语翻译As my train wasn't due to leave for another hour,I had p

英语翻译
As my train wasn't due to leave for another hour,I had plenty of time to
spare.
The underlined words,"to spare" prbably means "____".
A :to leave over or more than you need
B :to be free
画线的是 spare.
1:
第一句如何翻译?due to是不是叉开翻译?due to修饰那里?如果不要due to好像很顺
.因为我的火车要离开在另一个小时.
2：
是不是选B意思就不对了?free虽然有空闲,但不表示多余的意思吧.