问题描述：
It's nine thirty now and you'd better go,__________ you'll miss the train.
It’s nine thirty now and you'd better go,__________ you'll miss the train.
A.or else B.unless C.as if D.now that
请帮忙分析说明一下选这个答案的理由和原因,
It’s nine thirty now and you'd better go,__________ you'll miss the train.
A.or else B.unless C.as if D.now that
请帮忙分析说明一下选这个答案的理由和原因,
问题解答：
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