--- He got up so late because he sat up too late, preparing an important speech last night.---
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答案是A 难怪 完整讲法是It is no woner that he missed the train.
B答案 there was 错了
C答案 no doubt用法是there is no doubt that 不能乱省略
而且这里翻译成：毫无疑问 他错过了火车?那么我就要问了：你怎么知道他肯定错过了火车?从上文根本推断不出.
D.应该是I was not surprised
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