It took a long time for the connection between body temperature and illness .
A. to make
B. to be made
C. making
D. being made
网友回答
A. to make
(答案→)B. to be made
C. making
D. being made
解析：考察分词用法。The connection与make构成被动关系，所以使用被动形式。固定句型为：it takes sb some time to do sth;这个句型里使用不定式，这里也就是使用不定式的被动语态。