The smoggy weather has made us realize terrible problems we are laced with．
A. how
B. what
C. that
D. which
网友回答
A. how
(答案→)B. what
C. that
D. which
解析：考查感叹句，what引导感叹句修饰名词，how引导感叹句修饰形容词或是副词，这句话terrible problems是名词，用what引导感叹句，在整个句子中做宾语从句，句意：雾霾天气让我们意识到我们面临着多么可怕的问题啊。选B。