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________ some teenagers don’t realize is ________ difficult life can be after they get addicted to drugs.

A.What; how B.That; how C.What; what a D.That; what

A

解析试题分析:第一空是主语从句,what作realize的宾语,第二空是表语从句,how修饰difficult。句意:一些青少年所意识不到的是他们染上毒瘾之后生活是多么的艰难啊。
考点:考查名词性从句的连接词。

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