however as 区别________,when he started the research,he never gave up trying new ways to increase the production.我选的是however old he was,old as he was 为什么呢?________when he started the research,前面为什么不能用however？

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however as 区别________,when he started the research,he never gave up trying new ways to increase the production.我选的是however old he was,old as he was 为什么呢?________when he started the research,前面为什么不能用however？
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however as 区别________,when he started the research,he never gave up trying new ways to increase the production.我选的是however old he was,old as he was 为什么呢?________when he started the research,前面为什么不能用however？
however as 区别
________,when he started the research,he never gave up trying new ways to increase the production.
我选的是however old he was,old as he was 为什么呢?
________when he started the research,前面为什么不能用however？

however as 区别________,when he started the research,he never gave up trying new ways to increase the production.我选的是however old he was,old as he was 为什么呢?________when he started the research,前面为什么不能用however？
这里纯是语义选择了
however的意思是"不论多么"
as 在这里的意思是"正如,正像"
翻译起来
用however,"当他开始研究时,不论他多老,他从不放弃."
用as,"当他开始研究时,像他当时那么老,他从不放弃."
翻译过来好像不是很明确,不过用英文读时,就会发现,用as的语义更贴切
另外没有说有when 就不能用however的说法啊
比如 however difficult the problem was,when he started the research,he never gave up trying new ways to increase the production.
不论他开始研究时,问题有多难,他从不放弃.
这样语义对了,就可以这样用了

when he started the research, 这句在中间，HOWEVER 那个选项不能选
在一个就是意思的问题，本句句意为：虽然他很老，。。。。而不是不论他多老

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