单项选择题

To communicate precisely what you want to say，you will frequently need to define key words．（）

A．无论你想说什么，要做到简明扼要，关键就是要对词进行定义。
B．只要定义频繁出现的关键词就能准确传达本意。
C．要准确表达你的本意，就必须不断定义关键词。
D．要简明扼要地表达本意，就必须不断定义关键词。

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He（）the train if he hadn't been stuck in traffic jam on the way to the railway station.

A．couldn't miss
B．wouldn't have missed
C．mustn't have missed
D．shouldn't miss
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