they studied 280 banknotes in total ;all came from places where pe.
问题描述：
they studied 280 banknotes in total ;all came from places where pe.
they studied 280 banknotes in total ;all came from places where people buy food,like supermarkets,street vendors and cafe,_____those businesses often rely on cash.
选择：A where; B because.
原题选择B
请问1 选A,有没有语法错误?
2 为什么不能选A?有什么逻辑错误吗?
答
答：2012年职称英语理工类教材新增内容详解——完形填空篇1Vriesekoop is a microbiologist at the University of Ballarat in Australia．He led the study,which compared the germ populations found on money __...