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英语句子成分分析(6)Allthiswasofcoursejustastart,fromwhichourpresentradarhasdeveloped.分析下后半句是个从句吗fromwhich干吗的

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英语句子成分分析(6)
All this was of course just a start,from which our present radar has developed.
分析下后半句 是个从句吗 from which干吗的
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from which our present radar has developed 是定语从句,修饰start
from which 是 介词+关系代词的情况.