Never before in China __________ so carefully concerned about the food safety.
A．people have beenB．have people beenC．a(chǎn)re peopleD．people are
B
考查倒裝。Never，表否定意義，表否定意義的詞放在句首時(shí)，句子要用部分倒裝，排除A,D;根據(jù)時(shí)間狀語(yǔ)before，可知不能用一般現(xiàn)在時(shí)態(tài)，排除D。所以選B。
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