____ blood flows in a human body is a question ____ not everyone can understand fully.为什么填HOw , that?

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____ blood flows in a human body is a question ____ not everyone can understand fully.为什么填HOw , that?

____ blood flows in a human body is a question ____ not everyone can understand fully.为什么填HOw , that?
____ blood flows in a human body is a question ____ not everyone can understand fully.
为什么填HOw , that?

____ blood flows in a human body is a question ____ not everyone can understand fully.为什么填HOw , that?
这是一个主语从句,How blood flows in a human body作整个句子的主语,血液怎样在人体里流动,所以用how(怎样),第二个空用that,that引导的又一个定语从句,修饰前面的question.