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Food safety is important. Rules _____ to stop people from food pollution.
A.must makeB.must be made
C.can makeD.can be made
B

试题分析:句意:食品安全是重要的。制度必须制定来阻止人们污染食品。前句说道食品安全重要,因此必须制定制度,排除C和D;rules做主语应用被动语态,故选B。
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