is shown in the report teenager problems are often connected with family lifeeducation.A

问题补充：

is shown in the report, teenager problems are often connected with family lifeeducation.

A. Which

B. As

C. It

D. What

答案：

A. Which

(答案→)B. As

C. It

D. What

解析：考查非限制性定语从句。本题中的关系代词as指代后面一句话的内容，在句中做主语，引导非限制性定语从句。句意：正如报告中说明的那样，年轻人的问题常常与家庭教育有关。Which引导的非象征性定语从句不能放在句首。CD两项不能引导非限制性定语从句。故B正确。