As part of his studies he had to work in the mountains.\

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As part of his studies he had to work in the mountains.\
想问一下这里的as的用法是什么?作为介词吗?
可以直接放在句首引导短语吗?不需要加逗号吗在studies的后面?
和举一些类似的例子,作为介词引导短语放在句首的用法?

这句话应该可以转化为：he had to work in the mountains as part of his studies.
As part of his studies后面的逗号可加可不加,没有严格要求.
as可用作连词,引导比较、时间、原因及方式等四种状语从句,应注意的是,引导的比较状语从句往往有省略；引导的时间状语从句一般用一般现在时而不用一般将来时；引导原因状语从句时与“Because”和“since”引导的从句比较起起来语气最弱.
本题就是比较状语从句,是一种省略的用法.
as作介词,意思时“作为”,“以……身份”.例如：He came to China as a tourist five years ago.
而表示像…一样时,like通常作介词用,而介词后面通常接名词,代名词和动名词.
as in Australia“和在澳大利亚一样”.

He had to leave his ---------/waif/ to work in the countrysi He decided to work in the west part of China after graduatio 英语阅读理解Mr.Brown had to go to his camp in the mountains.It was As a result of his hard work,he has gained admission to the He had to （）it at the age of twelve and started to work in t The student ______ continuing his studies when he had to ret The ability to work independently as well as part of a team brown as well as two of his classmates _ invited to the part the ability to work individually or as a part of the 英语翻译One day Bob took two of his friends in-to the mountains. One day Bob took two of his friends in-to the mountains.They he had to wait until one of his coworkers came to work and -