It's important to learn how the whole system works. Sometimes, ， it's the details that interest us the most.
A. therefore
B. meanwhile
C. furthermore
D. though
网友回答
A. therefore
B. meanwhile
C. furthermore
(答案→)D. though
解析：考察连词，therefore因此，meanwhile与此同时 furthermore并且 though尽管
句意为，知道整个系统是如何运转是非常重要的，有时候，尽管如此，细节才是最让我们感兴趣的。