_ the influence of parents is important to children is _ to many.A.That,knownB.What,clearC.How,obviousD.Why,concerned

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_ the influence of parents is important to children is _ to many.A.That,knownB.What,clearC.How,obviousD.Why,concerned
_ the influence of parents is important to children is _ to many.
A.That,known
B.What,clear
C.How,obvious
D.Why,concerned

_ the influence of parents is important to children is _ to many.A.That,knownB.What,clearC.How,obviousD.Why,concerned
首先主语是一个结构完整的句子,所以主语部分不缺成分了,那么在句中必须充当成分的what ,就可以自然地排除了,所以,首先去掉B选项
其次,如果是how,那么主语部分应该是:父母对孩子的影响是怎样的,但句中已经说了:是重要的,所以B 也能排除了
D选项中的concerned是没有sth is concerned to sb 这样的搭配的,只能说 sb is concerned about sth
最后吧A选项带进去试试看
A :很多人都知道父母对孩子的影响是重要的
句意很通顺

A.
that引导名词性从句,指代后面那个事实“the influence of parents is important to children ”。
sth. is known to sb.某事为某人所知。
还有不懂可追问。