问题
选择题
Never before in China __________ so carefully concerned about the food safety.
A．people have been
B．have people been
C．are people
D．people are
答案
答案：B
考查倒装。Never，表否定意义，表否定意义的词放在句首时，句子要用部分倒装，排除A,D;根据时间状语before，可知不能用一般现在时态，排除D。所以选B。