题目内容

Food safety is important. Rules        to stop people from food pollution.
A．must makeB．must be madeC．can’t makeD．can’t be made
B
考查含有情态动词的被动语态的基本构成，情态动词+be+过去分词，句意：食品安全是重要的，必须制定规则使人们远离食品污染。Rule和make是被动关系，用must be made，选B。
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