how can you keep fit ___you somke so much?

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how can you keep fit ___you somke so much?
A when B while
答案为什么是A

这个考察when和while的用法.
首先基本上来说,while只可以与延续性动词连用,而while既可以与延续性动词也可以与短暂性动词连用.
其次,我们老师曾经总结过,while有三大用法
1.当...时,做这个意思时,通常要选when,因为when的适用范围更大
2.==however,然而
3.==although,尽管
此外,when还有一个特殊意思,就是既然,可以理解为now that
这道题,通过分析句意,可知道既然你吸这么多的烟怎么还能保持健康呢?
所以,很明显,这里应该用 when.
总而言之,这是考试的一个重点和难点.总结一下我上边的讲解吧,很有用的
有问题大家一起交流!

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