问题补充：
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
答案：
A. to make
(答案→)B. to be made
C. making
D. being made
解析：根据句型It takes some time to do sth.可排除C和D项，the connection between body temperature and illness和make之间为被动关系，故选B项。
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