you_jump onto a bus_it is still moving,It is too dangero

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you___jump onto a bus___it is still moving,It is too dangerous.
A.can;while B.must;when
C.can't;when D.mustn't;while
Tell me why?

选D
这个意思是,你——跳上车——还在移动,太危险了
a.能,当
b必须,当
c不行,当
d,禁止,当
B和A都跟表达的意思不符合,所以排除
D和C都是对的,只不过D更强烈,表达意思更明确,所以在这里我觉得肯定是D
再问：如何区别when和while？
再答：恩，这个我觉得我解释得不够好，不过帮你查了下回答的很好的连接 http://zhidao.baidu.com/question/5469703.html 请看把如果觉得解释麻烦的话 while+进行时 when+一般时。你可以吧句子分成两半来看，就简单多了

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