7.great changes have taken place since then in the factory _

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7.great changes have taken place since then in the factory ___a____we are working.
a.where b.that c.which d.there
in不是前面有么,为什么要用where

答案选a.where
【解析】定语从句的关键在于：找出先行词（即被定语从句所修饰的名词/代词）,将其代入定语从句中,看从句的连接问题.
如果能直接连接,或可以直接充当定语从句的主语/宾语/表语时,一般使用关系代词；
如果不能,且需要额外加上介词,并一起在定语从句中充当状语时,则使用关系副词.
此题将先行词the factory（先行词只能是名词/代词,有时也可以是句子）放入定语从句中,明显为：we are working (at/in) the factory
即必须加上介词at/in,然后一起在从句中充当（地点）状语,所以用关系副词where.

7.great changes have taken place since then in the factory _ Great changes have taken place since then in the factory ___ Great changes have taken place since then in the factory (wh Great changes have taken place since then in the factory whe "Great changes have taken place in China since the introduct Great changes have taken place in my hometown since 1930. Great changes have taken place since liberation Great changes have taken place in China since the People’s R great changes have taken place in our school since the gover great changes have taken place in the village ____the years Great changes have taken place ...in china Great changes have taken place in China.