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    【题目】Food safety is important. Rules ________ to protect people from food pollution.

    A. must make B. must be made C. can't make D. can't be made

    【答案】B

    【解析】试题分析：句意：食品安全很重要。必须制定措施保护人们远离食品污染。结合语境可知本句主语是动作对象，故用被动语态，含有情态动词的被动结构是情态动词加be 加动词的过去分词，根据句意，选B。

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