But what accounts ______ its amazing popularity or even the properties that have made millions of people confess to being chocoholics?
 
【正确答案】for
【答案解析】 句意：是什么能够解释巧克力令人惊异的受欢迎程度或者说让数以百万计的人们甘愿成为巧克力嗜好者这一繁荣现象呢?account for 解释，说明……的原因。