一道BEC题But the average person seldom achieves more than twelv

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一道BEC题
But the average person seldom achieves more than twelve words by a minute when using this method,while touch keyboarding can acheive up to 120 words,if enabling you to work almost as quickly as you can think.请问,这里的when为什么不是多余的,它是一个连词后面不是要接一个完整的句子吗,可是后面没有啊.这个句子是个什么结构?越详细越好.
对不起，原句没有if,和最后一个单词think,刚才打的时候忘记了

第一句句子的主干结构是主谓宾结构,后面when引导的是状语从句,（具体是原因、方式还是条件状语从句我分不太清了,不好意思）之所以不完整,是省略用法,可以补充成when they are using this method.省略的时候根据动词与主语之间的关系,选择用ing或是ed形式.
状语从句的"简化"现象常存在于以下五种状语从句中:①由if, unless等引导的条件状语从句;②由although, though, even if / though等引导的让步状语从句;③由when, while, as, before, after, until / till等引导的时间状语从句;④由as, as if等引导的方式状语从句;⑤由as, than等引导的比较状语从句.

Seldom is the weather more dramatic than when thunderstorms 英语翻译the average of three numbers is 10 more than the least o More than one person __ in the serious subway crash. 英语语法句子分析seldom is the weather more dramatic than when thund I'M only an average driver,so I can't do more than drive the , but more people, because the wrong person alone, and lonel 一道英语经典题,___is greater than God___is more evil than the Devil The Big Screenis more(expensive)than most cinemas,but Cinema 英语翻译Accidents are commonplace and more than average working Team means Together Everyone Achieves More 中文翻译关于rather than,more than的一道英语题. 一道英语修辞题I have always sought but seldom obtained a parking sp