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高二英语语法分析It took more than two decades,though,until 1951,for

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高二英语语法分析
It took more than two decades,though,until 1951,for regular colour TV broadcasts to begin in the USA.这里边,For和to都是作什么成分啊?
高二英语语法分析It took more than two decades,though,until 1951,for
这句话可以这样看,把逗号隔开的部分先去掉,It took more than two decades for regular colour TV broadcasts to begin in the USA.
也就是,It took 一些时间 for sth.to do sth.
这样的话,for 和to 的成分就很明显了吧,for是介词,而to是动词不定式.
It took my mother more than two hours columbus sailed for more than two months to across it It has ____ for more than two weeks It took us more than two hours preparing the dinner.这个句子是否正确 it took me more than two hours to finish my homwork 保持原句意思 英语语法分析请教各位大神：有一句话：There are more than two dozen free museums It took more than…… it took two more weeks for sentencing to come up 中文意思, 5.It took Laurence Oliver more than an hour to make up for t It took Chinese people more than 4 years to prepare for the that is more than two for every three aotomobiles.怎么分析,结构?th It has____for more than two weeks