________ is shown in the report,teenager problems are often

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________ is shown in the report,teenager problems are often connected with family life education.
A which B as C what D it
选B as 请问为什么分析的详细解答的细致些说说A C D 为什么不对

首先判断这是非限制性定语从句需要用关系代词代替后面的整句话作定从中的主语.
选项A 引导非限制性定从时 ,不能放在前面.
选项C 只能引导名词性从句 ,故错.
选项D 不能引导从句.
如果选D的话须把句子中逗号去掉换成that.that从句就成了主语从句.
所以答案是 B .关系代词as 代替要表达的后面的整句话引导非限制性定从,并在定从中作主语.

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