for which, which for, that which; market, marketing, markets Tho

for which, which for, that which; market, marketing, markets Thomas Moore owned a farm about 20 miles outside the city of Washington,_______the village of George town was the_______center.
【正确答案】：for which ；market
【题目解析】：英语中有一个规定就是一般不会在句尾放介词（介词后面一定有名词）。所以在碰到从句的时候，特别是which或者that所指代的词在从句中视作介词后面的名词出现的时候，就必须用which，并将介词前置。关系代词which在这里是指代the city of Washington，后面的从句的应该写成the village of George town was the market center for the city of Washington。