Question

It took a long time for the connection between body temperature and illness to be made.

It作什么成分?connection作什么成分? to be made作什么成分?

Answer 1

it 是形式主语 connection是主语的一部分，the connection between body temperature and illness to be made做主语，to be made做目的状语

Answer 2

for the connection between body temperature and illness to be made.
这个整体是介词短语作状语，对...来说。connection当然是做介词for的宾语。
to be made是不定式的被动式做illness的后置定语。
至于It 是主语，作无人称动词的主语,表示时间、气候、距离等
这里不应该看成形式主语，因为句中无真正主语成份。

Answer 3

it在这里是形式主语， connection是作为宾语的， to be made在这句话里是真正的主语。
实际语句可以是：To make the connection between body temperature and illness would take a long time.

Answer 4

It作形式主语，connection作宾语， to be made作真正主语。
between body temperature and illness 是宾补

Answer 5

It作形式主语，connection作宾语， to be made作真正主语。