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问题: George Washington was born in 1793 in a very rich

George Washington was born in 1793 in a very rich family in _________is now the state of Virginia.
A where B what
(答案是B,为何不选A,或者帮我分析一下连接代词与连接副词的区别,或帮我归纳下where在名词性从句中的作用,要详细)

解答:

因为in是介词,介词后面跟名词性从句。而what在这个宾语从句中做主语。where引导的是副词,是不能做主语的。