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The question that puzzled them is ______ they can get rid of

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The question that puzzled them is ______ they can get rid of the air pollution in the area
A.how is it that B.that how
C.what is it D.how it is that
①答案为D为什么B不可以,选D的原因
②这句话为什么是表语从句而不是同位语从句
谢谢!
The question that puzzled them is ______ they can get rid of
答案为D
三个句子两连词够了,The question is...;that puzzled them和they can get rid of the air pollution in the area共三句,that为一连词,如果B项就多个连词,而D项又加入强调句it is这句就需要三连词了.
表语从句.从句的命名要看在主句中作什么成分,放在系动词is后作表语,当然叫表语从句.同位语从句是放在抽象性名词后起解释说明的作用的名词性从句.